1. Heat olive oil in a large saucepan over medium heat until it shimmers. Add onion, carrots, celery, and garlic. Sauté for 4–6 minutes, or until the onion becomes translucent.
2. Add the ground lamb, breaking it apart with a wooden spoon. Cook for about 8 minutes, or until browned. Season with salt and pepper.
3. Stir in marinara sauce, cumin, coriander, cinnamon, and red pepper flakes. Bring to a simmer, then reduce heat to medium-low. Cover and simmer for 30 minutes, stirring occasionally, until the sauce thickens.
4. Remove from heat and stir in the coconut milk.
Assemble
Serve the bolognese over the cooked spaghetti squash.
Garnish with freshly grated parmesan cheese, if desired.