Salt the tomatoes: Slice the tomatoes and place them in a strainer over a bowl to catch the juices. With clean hands, give the tomatoes a gentle squeeze to start the juicing process. Salt them and let them sit while you do the rest of the prep.
Toast the bread: Slice the bread into about 4-5 thick slices and cut the slices into 1-inch cubes. Line the air fryer basket with parchment paper and place the bread pieces in. Drizzle a little olive oil, shake the basket to mix and air fry on 200 for 5 minutes. Or place the bread pieces on a baking tray, bake in the oven 200°C/400°F for 10 minutes. In both methods, check halfway through, if you’re happy with the color, take them out.
Prep the vegetables: Thinly slice the red onion, peel and seed the cucumber, then slice it. Thinly slice or chop the garlic and anchovies.
Fresh basil: Roll the large basil leaves together, slice them, and keep the baby leaves for garnish.
Combine: Add the cucumber, onion, squeezed tomatoes (from earlier), sliced fresh basil leaves, anchovies, sliced garlic, and capers all into a large salad bowl.
Bread Pieces: Add the toasted bread pieces, little of the tomato dressing and toss together.
Serve: Taste and serve with the remaining tomato vinaigrette and a drizzle of olive oil. Garnish with tender basil leaves.