Awesome. There's a lot to do with the pressure cooker. I'll keep adding in recipes here, hope you and Betsy have fun with them. Let me know if you need any particular spices for some of these.
For most Indian legume dishes (channa masala, rajma [kidney beans curry], etc), the approach is pretty standard:
Soak the dried legume for anywhere from 6 hours to overnight (usually 1 cup of the dried legume to 2 cups of water)
Pressure cook the legumes (usually 6-7 minutes at high pressure for kidney beans, 4-5 for white chick peas, 10-13 for black chick peas) until almost entirely done.
In a separate pan/skillet, saute a diced red onion, 1 tomato, minced ginger and garlic (most Indian grocery stores usually have ginger/garlic paste you can buy that makes this much easier) with some garam masala, cumin, salt, coriander seed powder and turmeric.
Lots of variations from here possible - you can add milk and cardamom (and maybe use more tomato/less ginger/garlic) for a sweeter, richer gravy; use more cumin and chilli powder for a spicier curry, etc - but I normally cook those together, then add to the legumes as they're done, stir, cover and let simmer over an hour with occasional spice adjustments for taste.
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First of a few daal recipes:
2 cups dried toor dal [yellow split pigeon peas], soaked 12 hours in about 5 cups of water (at room temp)
Pressure cook the daal for about 4 minutes at high pressure (or just boil for however long it takes). Once the daal's soft, add 3 cups water, 1-2 tbsp butter, salt, pepper, 2 pinches of asafoetida and any one of the following 'tadka's.
a) One small onion and one tomato, both diced small, and one finely chopped clove of garlic. Fry the garlic and onion first, then add the tomato; add in a tsp each garam masala and coriander powder, and 3 tsp freshly ground roast cumin (roast the cumin seeds on medium heat for a few minutes beforehand - you'll notice the aromatics changing a LOT - then grind)
b) An extra 2 pinches asafoetida, 4 tsp freshly ground roast cumin, half a tsp ground mustard seed, tsp of coriander
c) One diced onion fried with 3-4 crushed dried chillies, whole cumin, and mustard seeds (1 tsp of each)