I have friends who make their own Thai curry pastes. I admire them, but it’s just too much work for me. I use Mae Ploy brand paste, and am pleased with the results. This curry cooks while the rice steams, giving you a complete dinner in one pot. Blade roast is a cut of shoulder (a flat-iron steak is half a blade roast) that’s more tender than chuck roast, but if you can’t find it, just use regular chuck, sliced thin.