Assemble the rest by toasting the bread and layering on top the mozzarella, tomatoes, basil, and a drizzle of balsamic vinegar. Add a pinch of salt over top top taste. Alternatively, you could assemble the toast with mozzarella and tomato and roast in the oven, remove, and finish off with the basil, balsamic reduction, and salt after roasting for a caprese melt.