Mushroom and Spinach Korma

Name: Mushroom and Spinach Korma
Ingredients: 1 1/4 cups basmati rice; 1 medium red onion (1/2 roughly chopped, 1/2 thinly sliced); 1 2-inch piece ginger, peeled and roughly chopped; 1 plum tomato, chopped; 1 teaspoon ground cumin; 3/4 teaspoon ground coriander; Kosher salt; 2 tablespoons vegetable oil; 1 pound mixed mushrooms, sliced; 8 ounces baby spinach (about 8 cups); 1 15-ounce can chickpeas, drained and rinsed; 1/2 cup light coconut milk; Chopped fresh cilantro, for topping