Ingredients

• 1 small yellow onion, or ½ large yellow onion

• 1 celery rib

• ½ large carrot (if keto, omit carrot and double celery)

• 2 cloves garlic

• olive oil, as needed

• 10 oz fresh mushrooms

• 1 cup walnuts

• 3 tbsp tomato paste

• 12 oz passata tomatoes

• a few fresh thyme sprigs

• 1 bay leaf

• ½ tsp oregano

• ½ tsp crushed red pepper flakes

• salt and pepper to taste