Lemongrass Turmeric Tofu Curry

Name: Lemongrass Turmeric Tofu Curry
Cuisine: Asian, Thai
Ingredients: ½ block extra-firm tofu (7 ounces), pressed, cut into ¾-inch cubes; 1 tablespoon neutral cooking oil, plus 2 teaspoons for cooking (optional ); 1 small yellow onion, diced; 1 ½ tablespoons Mekhala Lemongrass Turmeric Paste; 1 medium sweet potato, cut into ½-inch pieces (about 1 ½ cups); 1 small head cauliflower, cut into florets (2 cups); 1 can unsweetened coconut milk (14 ounces); 1 tablespoon tamari or soy sauce; Fresh lime juice to taste; ¼ cup chopped scallions (green parts only), for garnish; ¼ cup chopped peanuts, for garnish (optional)