Chana Masala

Name: Chana Masala
Cuisine: Indian, Asian
Ingredients: 3 Tbsp. vegetable oil; 1 medium onion, finely chopped; 1 tsp. coriander seeds; 1 tsp. cumin seeds; 4 garlic cloves, finely chopped; 1 2" piece ginger, peeled, finely chopped; 1 tsp. garam masala; ¼ tsp. ground turmeric; Pinch of cayenne pepper or crushed red pepper flakes; 1 medium tomato, peeled, chopped; 2 14.5-oz. cans chickpeas, rinsed; 1 Tbsp. double-concentrated tomato paste; Kosher salt, freshly ground pepper; 1 tsp. cornstarch; 2 Tbsp. extra-virgin olive oil; Chopped cilantro and rice and/or flatbread (for serving); A spice mill or mortar and pestle