Prepare the rhubarb compote unless you already have it ready. (see note 1)
Preheat the oven to 175 degrees Celsius.
Slice the rhubarb stalk and place on an oven safe baking pan.
Add the balsamic vinegar and toss to cover the rhubarb stalks.
Bake in the oven for 15-20 minutes, until softened and warm but still have a bit of a crunch left.
Heat the rhubarb compote on low heat in a small pot.
Preheat a nonstick pan over medium heat with some olive oil.
Add the sliced bread and fry until golden brown on each side.
Place the warm rhubarb compote at the bottom of a deep plate. Top with the balsamic roasted rhubarb stalks.
Add the buffalo mozzarella on top, add freshly ground pepper and thinly sliced basil on top.
Serve with warm roasted bread.