Butternut Squash Crumble

Name: Butternut Squash Crumble
Ingredients: 1 cup flour; 1/2 cup walnuts, chopped coarsely; 1 tbsp chopped parsley; 1/2 cup grated Parmesan; Pepper, to taste; 6 tbsp butter, diced and at room temperature; Butter (for the dish); 2 tbsp olive oil; 1 tbsp butter; 1 x red onion, coarsely chopped; 1 tsp ground coriander; 1 x bay leaf; 1/2 cup canned tomatoes; 1 x peeled butternut squash, cut into 1-inch dice; 5 x fresh sage leaves, chopped; Salt and pepper, to taste; 1 tbsp chopped fresh parsley