Tomatoes are always a problem in our garden because we always have too many.

In summer of 2022 we somehow ended up with 49 tomato plants. This year, we swore not to do that again…and ended up with 60. It’s partly a “too many cooks in the kitchen” kind of thing—we buy tomato plants and then our neighbour who we share garden space with will surprise us with tomato seedlings he grew at the end of winter. We gave away a handful of plants, but still had an over-abundance this year.

But after making lots of salsa, pasta sauce, and tomato juice—and given that we still have leftover ketchup, green tomato chutney, and tomato soup from last year—I needed more recipes.

The Idea…

One way we like to think about gardening and food processing is to look at what we buy in the grocery store and ask ourselves if we can do that ourselves at home. We landed on butter chicken and curries.

I tried looking for butter chicken canning recipes and came up with nothing. Absolutely nothing. There appear to be no lab-tested recipes. Further, people who cook butter chicken and curries from scratch often write about how the freshness of the ingredients is what makes it really good, and canning would dampen that freshness.

If I were to make it from scratch, though, I’d be using dried spices since I’m not going to find a lot of fresh Indian spices in Winnipeg unless I perhaps go to very specific grocery stores.

So… my determination to do this project in hand, I set off in new directions.

In the strictest of senses, this would be considered “rebel canning”, which are canning recipes that are not lab-tested and thus can’t be guaranteed for safety. However, I decided to work within the canning rules and I’ve come up with something that works. You are allowed to swap out dried spices in a recipe or adjust the dried spices, provided you’re not putting in huge gobs of dried spices and turning a sauce into a thick paste.

With that in mind, I looked at my super easy canned pasta sauce recipe. Really…butter chicken is a tomato-based sauce with Indian spices. There’s a bit more to it—like adding butter, which is a no-no for canning—but a good sauce base would give me what I need to make a super convenient dinner.

Finding a standard butter chicken spice mix was my next challenge. There does not seem to be a standard.

I eventually settled on this:

• 1/2 tsp ground cinnamon
• 2 tsp smoked paprika
• 3 tsp garam masala
• 2 tsp ground coriander
• 1 tsp ground cardamom
• 2 tsp ground cumin
• 1 tsp ground ginger
• 2 tsp ground turmeric
• 1/2 tsp cayenne pepper

This make more than you need—which is just two or three tablespoons—but if you’re like me and you’re swimming in tomatoes at the end of the season, you’ll likely be making multiple batches.

This year when I was looking for something in the spice aisle at Safeway, I discovered they carried a premixed butter chicken spice. After quickly checking there was no cornstarch in it (which is sometimes added to prevent caking, but is a strict no-no for canning), I bought a couple bottles and used this rather than the homemade spice mix.

(If you don’t have a lot of spices at home already, buying a premixed spice mix is way cheaper than buying half a dozen individual spices.)

(I fully recognize that as a person who does not share this heritage, I am basing my tastes on Western ideas of what butter chicken should taste like. If you have a more authentic spice blend, I would love to hear about it!)

Making Butter Chicken Sauce

Maybe “sauce base” is more accurate, since during the dinner-cooking stage, you can add coconut cream and/or butter.

Anyway, it’s fairly straight forward, so I won’t write out the whole thing in this post. (It’s identical to the pasta sauce recipe, just with different spices.)

In a nutshell, you put the tomatoes in your slow cooker. If you’ve got oodles of cherry tomatoes, just wash and de-stem them and load them into the slow cooker. If you’ve got bigger tomatoes, chop them up a bit and perhaps de-core them if they’ve got dense cores.

Throw on some of your seasoning—I used about two tablespoons for a 12-cup slow cooker’s worth of tomatoes—and let it simmer on high for about two and a half hours or on low for about five hours.

Once everything is cooked, blend it all up with a handheld / stick blender. Give it a taste and add more seasoning if you feel it needs more.

From here you can either use it fresh if you’re using it in the next day or so. You can freeze it in dinner-size portions. Or you can can it in a water bath canner.

I find one-cup / half-pint jars make enough sauce for two people, so I do them all up in this size. You’ll want to add half a tablespoon of lemon juice to each jar (or a tablespoon to a pint jar, or two tablespoons to a quart jar) and add in sauce, leaving a half-inch headspace. Wipe the rims, put on the lids to fingertip tightness, and process for 35 minutes (adjusting for altitude if necessary).

Using Your Butter Chicken Sauce

When it’s dinner time, I fry up some chicken and veggies in a pan and then dump in a jar of butter chicken sauce. If I feel it needs a little more “sauciness”, I might add in a small can of coconut cream. And since it’s butter chicken, I add a dollop of butter and stir it until it melts and fully incorporates. Serve over rice and with a side of naan.

Delicious.