Heat 1 tablespoon oil in a Dutch oven over medium-high heat. Add leeks; sauté 3 minutes. Add ginger, serrano, and garlic, and sauté 1 minute. Stir in soy sauce, curry, and sugar. Add water, squash, salt, and coconut milk; bring to a boil. Reduce heat; simmer 15 minutes.
Heat 1 tablespoon oil in a large nonstick skillet over medium-high heat. Add tofu; sauté 12 minutes or until golden brown, stirring occasionally. Add tofu and juice to squash mixture. Serve over rice; sprinkle evenly with peanuts and cilantro.