Heat the oil in a shallow frying pan. Add the garlic and cook for a minute. Stir in the mushrooms and cook for 3-4 minutes.
Cut the ciabatta in half, then cut in half through the middle. Place the four pieces under a hot grill until browned.
Top with garlic mushrooms and Saint Agur, return to the grill to melt the cheese a little.
Serve sprinkled with the basil and black pepper and drizzle with any juices from the frying pan.
Tip: Delicious served with baby leaf salad.