Set rice cooker setting to “sauté” (or similar), and preheat 2 to 3 minutes. Add coconut oil, and heat 1 minute more. Add onion, garlic, and carrots, and sauté 5 to 6 minutes, or until vegetables are softened. Add cumin, turmeric, and red pepper flakes; cook 1 minute more.Adjust rice cooker setting to “slow cook” (or similar). Pour in 4 cups water, stir in split peas, and season with salt and pepper, if desired. Cover, and cook 3 to 4 hours, or until peas are soft. Thin dal with water, if desired. Serve drizzled with lemon juice, and garnish with cilantro (if using).