Thinly slice onion and cover with vinegar.

Well, heat the grill or pan. Smear 1 tbsp butter slices of bread from both sides. Fry on the grill until Golden brown on both sides. RUB the bread with the garlic clove and cut into cubes. My bread was not white but grey home-made with whole grain supplements.

Tomatoes cut into slices (the middle bit with the seeds I removed that the bread was not soaked). To the onions with the vinegar, pour the rest of olive oil and whisk. Pour this sauce sliced tomatoes and bread. Add the finely torn Basil and arugula. Serve immediately so the bread remained crispy.