THE LATIN AMERICAN KITCHEN by Elizabeth Luard (2003) is a book I find very helpful. I get it out of the library every so often and keep it for months. It has entries with pictures for around 100 essential ingredients in Latin American cooking, from achiote to zapote, grouped into vegetables, chiles, grains, legumes, herbs, spices, fruit, and nuts, as well as meat and seafood. Each entry has pictures and descriptions, and 2 or 3 recipes, so it's great if, for example, you want to know what chayote, amaranth, or masa harina are, and what you can do with them. I always wanted to find something to do with the waxy brown tubers I saw in the market, variously called cassava, yuca, or manioc in different parts of South America. The waxy coating, it turns out, is a preservative layer, which is removed along with the rough bark underneath it. The white inside is bland and starchy, but absorbs spicy flavors wonderfully. Cut into chunks, and boiled or steamed (be careful not to overcook or it turns gluey), the flesh becomes almost translucent and buttery in flavor. Here's one of Luard's recipes, from Cuba, a great dish to serve alongside beans and greens, or enchiladas:
Yuca con mojo
Peel 3 lbs. cassava root and cut into chunks. Boil in salted water for 30 minutes until soft, then drain thoroughly. Meanwhile heat 1/4 cup olive oil in a small skillet and lightly fry 4 cloves mashed garlic. Add 1/4 cup lime juice and bring to a boil. Pour over the cassava chunks immediately after draining them, and top with chopped cilantro.
You can substitute lemon juice for the lime, and I like to add a pinch or more of red pepper flakes with the garlic, too.
P.S. The leftovers fry up wonderfully too -- they get a great crisp exterior while staying moist inside. I fried them for 10 mins. in olive oil, then for another 10 mins. after adding big strips of red bell pepper, then added red kidney beans and some finely chopped roasted serrano chili for the last couple of minutes.