Am assuming that
@Dave7 isn't about to raid my kitchen cupboards, sooo...
Into a hot frying pan... A couple of tablespoons of oil, some finely chopped garlic and finely chopped ginger, some curry powder to taste*. Sweat that off for a bit, then add one large or two small sliced onions and cook till the onions are nice and soft but not golden.
Slow cooker... One can of chopped tomatoes, a stock cube (either veg or chicken) and the contents of the frying pan.
Brown off your meat (if using) and add to the crock pot. Cook on low for about 5 hours before adding a can of chick peas and your veggies cut into decent sized chunks. Cook for a further 3 hours. If you want a creamy curry, add a tablespoon or two of natural yoghurt or double cream.
* There are loads of different curry powders around, so use what you prefer. For a basic generic curry as given above, I use a mild one or garam masala and then throw in chilli to taste.