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Toast the bread in a toaster. Meanwhile, mix the cheese sauce, onions and a grind of pepper together in a small bowl.
Transfer the toast to a non-stick grill rack and drape the ham over each slice. Next, spoon the cheese sauce onto the ham and spread it around with the back of the spoon. Scatter the grated cheese over the sauce, then pop the rarebit under a hot grill until the cheese turns bubbly and golden. Cut each slice in half and serve while still hot.