I usually peel the eggplant first if it has a thick skin, but that's a matter of personal preference.Cut eggplant into ½-3/4 inch slices, and brush one side of each eggplant slice with olive oil.Put the oiled side down and grill - either over an outside bbq or in a grill pan - over medium-high heat until softened; about 3 minutes.Brush the facing side with oil and then flip the eggplant slices over.Cool eggplant slices.In a small blender or food processor, combine ginger, garlic and water, and blender until almost smooth. (I usually add a little of the canned tomatoes to give the blender a little more to work with.Heat 1 tablespoon of oil in a large skillet. When hot, put the fennel and cumin seeds in the skillet and cook until they turn a few shades darker. This will only take a few seconds, so have the other ingredients ready. Pour in tomatoes, and add remaining spices. Stir and cook about 5 minutes to thicken slightly.Layer eggplant and sauce in a casserole dish, ending with sauce. Cover and bake at 325° for 20-30 minutes.Serve warm or cold.