Burgers with Butternut Squash and Caramelized Onions

bulk Italian sausage -

grassfed ground beef -

onion - 1/2 cup, finely chopped

sweet red pepper - 1/2 cup, finely chopped

garlic cloves - 2, finely minced

crushed red pepper - 1/2 tsp, or more, to taste

pastured eggs -

sea salt -

freshly ground black pepper -

extra virgin olive oil -

butternut squash - 1 small or medium, peeled, seeded and cut into one-inch chunks

extra virgin olive oil or coconut oil -

caramelized onions -

large lettuce leaves -