1 Tbs. olive oil
1 large onion, finely chopped
2 serrano chiles, chopped
6-inch (15 cm.) piece fresh ginger about 1 inch (2.5 cm.) in diameter, peeled and minced
1 tsp. cumin seeds
2 cans chickpeas (15 oz./470 g. each), with liquid
1 (14.5 oz./455 g.) can diced tomatoes
1 Tbs. fresh lime juice
3/4 tsp. garam masala
1/4 tsp. ground turmeric
1/2 large head cauliflower, cut into 1-inch (2.5-cm.) florets
2 yukon gold potatoes, cut into 1/2-inch (12-mm.) pieces
Coarse kosher salt and freshly ground pepper
Cooked rice for serving (optional)
1/3 cup (1/2 oz./15 g.) fresh cilantro, minced