Preheat oven to 325°F.
In a medium saucepan, heat the olive oil and sauté the
onions until soft, 5 to 6 minutes. Add the peppers and celery
and sauté until soft, 4 to 6 minutes. Add the remaining filling
ingredients, stir well and bake, covered, for one hour. Cool
to room temperature. (The filling can be stored, covered and
refrigerated, for 2 to 3 days but bring the mixture to room
temperature before serving.)
Sprinkle the eggplants with salt and pepper and bake on
a cookie sheet until they are slightly withered and soft to
touch, 20 to 30 minutes. Cool to room temperature, and
store wrapped in plastic. They are best when baked the day
they are served.
To serve, flake the tuna and gently combine it with the
filling. Slice the eggplants in half lengthwise and hollow them
out using a small spoon. Brush the cut side of the eggplants
with the 2 tablespoons of olive oil. Stuff the hollowed bowl of
each eggplant with the pepper-tuna filling and serve.
Makes 16 servings.