DO-AHEAD TIP: Prepare squash and sausage.
Preheat grill to MEDIUM-LOW. Brush grill grate with the coconut oil.
In each half of cooked squash, place some sausage, an egg, a little onion and garlic; season with salt and pepper then place on the grill.
Close the lid and cook for 4 to 6 minutes or until egg whites are set, leaving only the yolks runny. Remove from grill and serve.