Slow Cooker Ratatouille

Name: Slow Cooker Ratatouille
Cuisine: European, Mediterranean, French
Ingredients: 1 1/2 lbs eggplant, , peeled and cut into one inch cubes; salt; 1 red onion, (about 2 1/2 to 3 inches in diameter), chopped; 2 red peppers, , seeded and chopped into large pieces; 1 14.5 oz can diced tomatoes; 3 cloves garlic, , minced; 1/3 cup olive oil; 3 summer squash, , sliced into 1/4 inch thick rounds; 2 tsp dried basil; black pepper