@msolga,
Reporting back: I made the vegetable curry yesterday, not the day I'd planned to, Caroline. (It was election night here & I got a bit distracted. Well, more than a bit!)
Anyway, it worked out fine. Leek & garlic, fried with black mustard seeds, cumin & garam marsala. Then thrown into the slow cooker with vegetable stock, light coconut milk & canned diced tomatoes. Along with some chopped kumara & carrots. Chick peas & brussels sprouts added in the last stages of cooking. Baby spinach leaves thrown in right at the very end. (Not cooked, wilted.)
Not bad at all, though I decided that it needed a bit more zing, so added some chili at the last stages.
I've never used Brussels sprouts before in a curry. A nice balance (along with the spinach) to the sweetness of the carrots & kumara.