Preheat your oven to 400 degrees
Place peeled and cubed butternut squash on a baking sheet
Drizzle with 2 tablespoons of olive oil, season with salt and pepper and toss to combine
Bake for 40-45 minutes or until fork tender
While the butternut squash is baking, combine 2 tablespoons of olive oil and the minced ginger, garlic and serrano chilies in a medium saucepan and place over medium to medium high heat
Allow the mixture to cook, stirring occasionally to scrape up brown bits from the bottom of the pan, until it begins to brown and become very fragrant
Add 1 tablespoon of tomato paste and the spices and stir to combine
Cook for 2 minutes, stirring consistently
Add the quartered tomatoes, 3/4 cup of water and a pinch of salt and pepper and bring the mixture to a simmer
Simmer for about 15 minutes or until the tomatoes have broken down
Transfer the mixture into a food processor or blender and pulse until smooth
Return the mixture to the sauce pan and place over medium low heat
Add 1/2 can of coconut milk and simmer over low heat from several minutes
Add the roasted butternut squash cubes and toss in the sauce
Serve with rice (optional) and garnish with finely chopped cilantro and lime wedges