Salsa is the Spanish word for "sauce." Mexican cuisine includes many raw and cooked salsas based on tomatoes or tomatillos with chiles. Salsa can be chunky or smooth, depending on the size of the vegetable pieces in it.
To test rice for doneness, remove a small amount from the casserole. Let it cool slightly. The rice is done when it's tender in the center.
Fresh cilantro sprigs are an easy, colorful garnish for this casserole.