In a large 12- to 14-inch saute pan, saute onions, garlic, pine nuts, currants and chili flakes in olive oil for 4 to 5 minutes over medium-high heat until softened.
Add eggplant, sugar, cinnamon and cocoa and continue to cook 5 minutes.
Add thyme, Basic Tomato Sauce, balsamic vinegar, salt and pepper and bring to boil.
Lower heat and simmer 5 minutes.
Cool to room temperature and serve on crostini or place in middle of table with crostini on the side to allow guests to serve themselves.