Preheat oven to 350°F.

Prepare lasagna noodles as directed on the package.

To prepare the squash, peel and remove seeds, trimming into 1 or 2 inch cubes. Place in a pot of boiling water and cook until just tender. Remove water and mash by hand. (You can also do this in the microwave if you have one.)

Place flour in a small saucepan over low to medium heat and very gradually whisk in milk and garlic. Warm milk slurry, stirring constantly, until sauce simmers and is thickened, about 3 minutes. (It will continue to thicken in the baking so don’t worry if it seems a bit thin at this stage.) Remove from heat and stir in Parmesan cheese, salt and pepper.?.

Spread 1/3 cup of cheese sauce over bottom of a 9 X 13-inch glass or metal pan and cover with 3 lasagna noodles; top with 1/3 of squash and 1/2 cup of cheese sauce. Sprinkle with 1/2 cup of mozzarella cheese and 1/4 cup of raisins. Cover with 3 more lasagna noodles and spread with 1/3 of remaining squash and 2/3 cup of cheese sauce; sprinkle with 1/4 cup of raisins. Cover with 3 more lasagna noodles and top with remaining squash and raisins; cover with last 3 lasagna noodles, pressing sheets firmly down. Top with remaining cheese sauce; sprinkle with pine nuts and remaining mozzarella cheese.

Cover lasagna with aluminum foil and bake for 15 minutes. Remove foil and continue baking until lasagna bubbles around edges and is browned on top, about 15-20 additional minutes.

Slice into 8 pieces and serve.