1 cup yellow split peas, soaked in cold water for 1 hour
1 large tomato (about 8 ounces), cut into 8 wedges
1/4 cup canola oil
1/2 teaspoon cumin seeds
1 medium red onion, finely chopped (about 1 1/2 cups)
5 large garlic cloves, thinly sliced
1 teaspoon coriander seeds, finely ground
3/4 teaspoon ground turmeric
1/4 teaspoon cayenne
1/4 cup minced cilantro leaves
1 tablespoon unsalted butter
1 teaspoon salt