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I make a yellow curry powder in bulk here is the recipe
1.5 tbs ground tumeric
.25 tbs ground cardamon
.5 tbs ground cinammon
.25 tbs ground ground cumin
.25 tbs ground ground coriander seeds
.25 tbs ground ginger
I just put it all in a glass jar and leave it in the cupboard then when it's time to cook just fry it on a low heat with garlic, ginger and lemon grass until it's fragrant then brown your meat and or veges and chuck in some coconut milk and palm sugar and fish sauce and boil it for a while until it thickened a bit. Or you can just chuck the whole lot into a slow cooker for a few hours. When I use the SC I find it tastes better if you brown the spices first then I stir the coconut milk into the frying pan to pick up all the browned bits.
Here are some other spice mixtures you can use - just adapt/adjust them to suit yourself.
Curry
6 dried red chillies (take the seeds out to reduce the heat)
8 tbs coriander seeds
4 tbs cumin seeds
2 tsp fenugreek seeds
2 tsp black mustard seeds
2 tsp black peppercorns
1 tbs ground tumeric
1 tsp ground ginger
roast or dry fry everything except the tumeric and ginger then grind them to a powder (a coffee grinder will do this really well or use a mortar) then put it in a jar and add the tumeric and ginger and shake it all about to mix them in.
You can reduce the heat by putting less chilli in and de-seeding the chilli.
You can also try adding a cinnamon stick, 6 cloves and 1 tbs fenel seeds before roasting.
It makes about 16 tbs.
Sambar powder
8-10 dried red chillis
6 tbs coriander seeds
2 tbs cumin seeds
2 tsp black peppercorns
2 tsp fernugreek seeds
2 tsp white split gram peas
2 tsp yellow split peas
2 tsp yellow mung beans
1.5 tbs ground tumeric.
Roast or dry fry the spices, repeat with the pulses (make sure they're evenly toasted - you need to shake them)
Grind the spices and pulses into a powder then mix the tumeric in and jar it up. It makes about 17 tbs.
Panch Phoran (Bengali 5 spices)
Mix equal quantities
Cumin seeds
Fennel seeds
Mustard seeds
Fenugreek seeds
Nigella seeds
You don't process it - just fry it in oil to flavour it before adding the main ingredients or fry it in ghee or oil and add it to vege and dahl dishes just before you serve.
Sri Lankan Curry Powder
6 tbs coriander seeds
3 tbs cumin seeds
1 tbs fenugreek seeds
5 cm piece cinnamon stick
1 tsp cloves
8 cardamom pods
6 dried curry leaves
1-2 tsp chilli powder.
Dry fry or roast the coriander, cumin, fennel and fenugreek seperately until they darken(they turn dark at different times).
Dry fry or roast the cinnamon, cloves and cardamom until they give off a spicy smell.
Remove the seeds from the cardamom then grind all the roasted ingredients with the chilli and curry leaves.
Makes about 12 tbs.
ETA 2 - it's really important to cook your spices (dry roast or fry). If you don't they can be kind of bitter.