Preheat the oven to 200º C for ten minutes. Beat butter in a bowl until smooth, add crushed garlic, coriander leaves, oregano and half the crushed peppercorns. Apply this butter on the French bread slices. Place the tomato slices on each bread slice and sprinkle some salt and the remaining crushed peppercorns. Place the corn kernels over the tomato slices and sprinkle grated cheese on top. Grill in the oven for ten minutes or until the cheese melts and turns golden. Serve hoT.