Ravioli in the Crock Pot

4 cups sliced button mushrooms 4 cups sliced baby portabella mushrooms 2 (14 1/2 ounce) cans diced tomatoes 1/2 cup water 1/3 cup dry red wine 4 minced garlic[...]

1 medium onion , finely chopped (divided into thirds) 2 (25 ounce) packages frozen beef ravioli 2 garlic cloves , minced 3 teaspoons dried basil 2 teaspoons[...]