Spaghetti Squash Lasagna Boats

pre-roasted spaghetti squashes halves ((using this recipe))

bolognese sauce ((for slow cooker bolognese, use this recipe)*)

olive oil

garlic (, minced)

| 1 pound lean ground minced beef ((or chicken or turkey))

x 400 grams | 14 ounce bottle Passata ((marinara sauce, U.S tomato sauce or crushed tomatoes))

tomato paste

beef bullion cube (, crushed)

sugar ((if needed))

fresh chopped parsley (, divided (plus a little extra, to serve))

each of dried oregano and basil

Salt and pepper (, to taste)

part skim ricotta cheese

fresh grated parmesan cheese

shredded mozzarella cheese