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Here is a short video explaining the process, scroll down for detailed ingredients and step by step recipe method. Thanks for coming and do not forget to check other recipes on our homepage.
I’ve spent years making preserves the old way, and I want to walk you through a homemade version that gets remarkably close to that bottled taste, using nothing but real ingredients from your kitchen. This isn’t a quick five-minute ketchup. It’s a proper stovetop sauce, the kind your grandmother probably made, and it rewards a little patience with a jar of something genuinely better than store-bought.
Ingredients With Exact Amount
Getting your measurements right from the start is what separates a sauce that tastes balanced from one that’s either too sharp or too sickly sweet. Below is everything you’ll need, measured out for a batch that makes roughly 1.2 to 1.5 litres of finished sauce, enough to fill three to four standard sauce bottles.
Main Ingredients
You’ll need 2 kilograms of ripe red tomatoes, roughly chopped, along with 1 large cooking apple (about 200g), peeled, cored and chopped into chunks. Add 2 medium brown onions, peeled and roughly chopped, and 1 clove of garlic, finely chopped, which isn’t traditional in every recipe but adds a lovely rounded depth. These four ingredients form the base of the sauce and give it that fruity, savoury backbone that plain tomato ketchup simply doesn’t have.
Sweetener and Vinegar
For sweetness and tang, you’ll need 220 grams of brown sugar, packed firmly into the cup, and 250 millilitres of malt vinegar, which is the classic choice in New Zealand and gives the sauce its familiar sharp edge. If you can’t find malt vinegar, white or apple cider vinegar will work, though the flavour will lean slightly different. These two ingredients balance each other out during cooking, so don’t be tempted to reduce the sugar too much or the sauce will taste harsh.
Spices and Seasoning
To build that warm, unmistakable background flavour, gather 1 teaspoon of fine salt, half a teaspoon of cayenne pepper, a quarter teaspoon of ground cloves, a quarter teaspoon of ground allspice, and 6 whole black peppercorns. If you have whole cloves and allspice berries on hand instead of ground, even better, since you can tie them in a small piece of muslin cloth and remove them later for a cleaner-tasting sauce. This little bundle of spice is really the soul of the recipe, so don’t skip it even if your pantry only has the ground versions.
Step by Step Recipe Method
This is the part where patience pays off. Homemade tomato sauce isn’t difficult, but it does need slow, steady cooking so the flavours have time to concentrate properly. Follow these steps in order and you’ll end up with a rich, thick sauce rather than a thin, watery one.
Preparing the Vegetables and Fruit
Start by washing your tomatoes thoroughly and roughly chopping them, skins and all, since you’ll be straining everything later anyway so there’s no need to peel them first. Peel and core your apple, then chop it into small chunks so it breaks down quickly during cooking. Peel your onions and garlic and chop them fairly finely, as smaller pieces cook down faster and blend more smoothly into the final sauce. Having everything prepped and ready before you start cooking makes the whole process far less stressful.
Cooking the Base
Place the tomatoes, apple, onion and garlic into a large, heavy-bottomed pot, the biggest one you own, since the mixture will bubble and reduce quite a lot. Add your malt vinegar and brown sugar, along with the salt, cayenne pepper, ground cloves and allspice. If you’re using whole spices tied in muslin, drop the little bundle in now as well. Give everything a good stir over medium heat until the sugar has dissolved and the mixture starts to release its juices.
Simmering the Sauce
Bring the pot up to a gentle boil, then reduce the heat right down to a low simmer. Let it cook uncovered for about 1.5 to 2 hours, stirring every 10 to 15 minutes so nothing catches on the bottom of the pot. You’ll know it’s ready when the tomatoes and apple have completely broken down into a soft, pulpy mixture and the liquid has reduced significantly. The kitchen will smell incredible by this point, warm and slightly spiced, almost like mulled fruit.
Straining and Blending
Once the mixture is soft and pulpy, remove the muslin bag of whole spices if you used one, then pass the sauce through a fine sieve or food mill set over a clean bowl, pressing firmly with the back of a spoon or ladle to push through as much pulp as possible while leaving the skins and seeds behind. This step is what gives Wattie’s-style sauce its smooth, glossy texture, so don’t rush it. If you’d rather skip the sieving, you can blend the sauce with a stick blender instead for a slightly chunkier, more rustic result.
Final Boil and Bottling
Return the strained sauce to a clean pot and bring it back to a boil for a further 2 to 3 minutes, which helps thicken it slightly and ensures it’s properly hot for bottling. While it’s still hot, carefully pour it into sterilised glass bottles or jars using a funnel, leaving a small gap at the top, then seal tightly straight away. As the sauce cools, you should hear the lids pop down slightly, which tells you they’ve sealed properly and will keep well in the pantry.
Variations in the Recipe
Once you’ve made this sauce a couple of times, you’ll start to notice small ways to make it your own. Homemade tomato sauce is forgiving, and cooks all over New Zealand have been tweaking this basic formula for generations.
Sweeter, Milder Version
If you’re cooking for kids or prefer a gentler flavour, cut the cayenne pepper back to a pinch and add an extra tablespoon of brown sugar. This softens the heat considerably while keeping that familiar sweet-tangy profile that makes the sauce so easy to pair with almost anything, from sausages to scrambled eggs.
Extra Spiced, Smoky Version
For a deeper, more grown-up flavour, try adding a quarter teaspoon of smoked paprika along with a small cinnamon stick during the simmering stage, removing it before you strain the sauce. This gives the finished sauce a warmer, slightly smoky background that works beautifully with grilled meats and barbecued food.
Chunky, Rustic Style
If you don’t mind a more textured sauce, skip the straining step entirely and simply blend the cooked mixture with a stick blender until it’s smooth but not sieved. You’ll lose a little of that glassy, bottled-sauce shine, but you’ll gain a heartier, more homemade texture that’s fantastic spooned over meatloaf or savoury pies.
Mistakes to Avoid
Even a simple recipe like this one can go slightly wrong if you rush certain steps. Here are the most common trip-ups I see people make, along with how to steer clear of them.
Cooking on Too High a Heat
One of the biggest mistakes is trying to speed things up by boiling the sauce hard rather than letting it simmer gently. High heat causes the sugars to catch and burn on the bottom of the pot, which gives the whole batch a bitter, scorched taste that no amount of extra sugar can fix. Always keep the heat low and steady, and stir often, especially once the mixture starts to thicken.
Skipping the Straining Step
It might feel like an unnecessary extra step, but skipping the sieving or milling stage leaves you with a sauce full of tough tomato skins and seeds, which changes both the texture and the mouthfeel quite dramatically. If you want that smooth, pourable consistency people expect from bottled sauce, take the time to strain it properly, even though it does add a bit of elbow grease to the process.
Not Sterilising the Bottles Properly
Bottling hot sauce into jars that haven’t been properly sterilised is a common way to end up with sauce that spoils within days instead of lasting for months. Always wash your bottles well, then heat them in a low oven or run them through a hot dishwasher cycle just before filling, and make sure the lids are heated in boiling water too. Skipping this step is asking for trouble, especially if you’re planning to store the sauce for a while.
Conclusion & FAQs Section
Making your own version of Wattie’s Tomato Sauce at home is one of those old-fashioned kitchen projects that feels genuinely rewarding once you taste the result. It takes a bit of time on the stove, but the process is simple, and there’s something special about pulling a bottle of your own sauce out of the pantry months later. Once you’ve got the base recipe down, feel free to play with the spice levels and sweetness until it matches your own family’s taste exactly, the same way generations of Kiwi home cooks have done before you.
How Long Does Homemade Tomato Sauce Last?
Once properly bottled in sterilised jars and sealed while hot, this sauce will typically keep well in a cool, dark pantry for around 6 to 12 months unopened. After opening, store it in the fridge and use it within 4 to 6 weeks for the best flavour and safety, just as you would with any homemade condiment that doesn’t contain artificial preservatives.
Can I Freeze This Sauce Instead of Bottling It?
Yes, freezing is a great option if you’d rather skip the sterilising process altogether. Simply let the sauce cool completely, then pour it into freezer-safe containers or bags, leaving a little room for expansion, and it will keep well in the freezer for up to six months. Thaw it in the fridge overnight before using.
Why Is My Sauce Too Thin?
If your sauce turns out runnier than expected, it usually means it wasn’t simmered for quite long enough to reduce properly. Simply return it to the pot and let it cook uncovered over low heat for another 20 to 30 minutes, stirring regularly, until it thickens up to the consistency you’re after.
Can I Use Tinned Tomatoes Instead of Fresh?
You can, particularly out of tomato season when fresh ones are expensive or lacking flavour. Use around 2.5 kilograms of good-quality tinned whole tomatoes in place of the fresh ones, and reduce the simmering time slightly since tinned tomatoes break down faster than fresh ones do.