Use 5 to 6 small green chile peppers, such as Thai chiles; if they're unavailable, substitute 2 to 3 serrano chiles or to taste. Use rubber gloves when chopping chile peppers.
Slow Cooker Directions:
Follow steps 1 and 2. Place the onions, spice mixture, and 1/2 cup water in the slow cooker; reserve the remaining water. Add the beef and cook on Low for 8 to 10 hours or on High for 4 to 6 hours (you may brown the beef in the skillet first, if you wish). Add reserved water if you like a thinner consistency of curry.
Pressure Cooker Directions:
Cook the onions and spices in the pressure cooker instead of the skillet; add the beef in Step 4 and seal the lid. Bring to high pressure and cook until beef is tender, about 40 minutes. Allow pressure to release naturally after cooking.