Any of Lorna Sass's pressure cooker cookbooks, if you're not already adept at beans and grains in the pressure cooker.

Madhur Jaffrey's World of the East Vegetarian Cooking is a delicious and mostly simple introduction to the cuisines of all of Asia, from the Middle East to Indonesia - kind of a one-stop place for beginning cooks to sample different flavors and decide which cuisine(s) you want to learn in more depth.