2 tablespoons vegetable oil
1 1/2 teaspoons black, brown, or yellow mustard seeds
1 1/2 teaspoons ground turmeric
1 small onion, minced
2 garlic cloves, thinly sliced
1 Fresno chile or red jalapeño, cut into thin rings, seeded if desired
2 cups long-grain white rice
4 2x1-inch strips lemon peel (yellow part only) plus 1/4 cup fresh lemon juice
2 teaspoons kosher salt
1/2 cup roasted cashews