Ratatouille and Polenta Pot Pie

Name: Ratatouille and Polenta Pot Pie
Ingredients: 2 1/2 Tbs. olive oil; 1 large onion, quartered and thinly sliced; 1 large eggplant, peeled and cut into 3/4-inch cubes; 1 tsp. salt; 1 large green bell pepper, sliced; 2 medium cloves garlic, minced; 2 cups canned crushed tomatoes or 2 large ripe tomatoes, seeded and chopped; 1 medium zucchini, cut into 1/2-inch dice; 2 Tbs. chopped fresh parsley; 2 to 3 tsp. tomato paste; 2 tsp. red wine vinegar; 1 tsp. dried basil or 1 Tbs. chopped fresh basil; 1 recipe Basic Polenta (soft version)