Bake or microwave the sweet potato until tender.

Plunge the cooked sweet potato into a bowl of cold water.

Cook the ravioli or tortellini according to package directions.

Drain the pasta and return it to the pot.

Heat the margarine in a small skillet over low heat.

Add the minced garlic to the skillet.

Sauté the garlic until golden, about 1 minute, then remove from heat.

Drain the sweet potato and peel off the skin.

Mash the sweet potato in a small mixing bowl.

Add the sautéed garlic to the mashed sweet potato.

Gradually add milk or soymilk to the sweet potato mixture, stirring until a thick sauce forms.

Season the sauce with salt and pepper to taste.

Combine the sweet potato sauce with the cooked pasta in the pot.

Cook the pasta and sauce until heated through.

Serve immediately.