Peel eggplant. Cut into cubes. Sprinkle with
salt. Leave for 30 minutes to draw out
some of the liquid. Wash well. Pat dry. Cook quickly in hot oil. Drain well and cool. Whisk together olive oil, vinegar
and mustard. Set dressing aside. Place tuna in a bowl with celery
and eggplant. Pour over dressing. Toss lightly. Garnish with olives. Refrigerate until required. Slice bread. Combine butter and
garlic. Coat each piece of bread. Place on a baking sheet. Bake in
moderately hot oven 190C/375F for 10 minutes or until brown and
crisp. Serve immediately with tuna salad.