In a nonreactive stewpot, saute the onions and garlic in the olive oil until translucent. Cut the eggplant into 1inch cubes and add them to the pot. Slice the pepper into 1inchsquare pieces. Crush the tomatoes. Add the peppers, tomatoes, apple juice or water, salt, and fennel to the pot. If using dried dill, add it now. Cover the pot and simmer, stirring frequently, until the eggplant is completely tender, about 15 minutes. Stir in the fresh dill, if used, and add the lemon juice and spinach. Simmer for another minute or two until the spinach wilts but is still bright green. Add salt and pepper to taste.
This tangy stew is delicious over rice or couscous. Serve topped with grated feta cheese, if desired