Select the desired number of good-sized tomatoes, allowing one to each person. Cut off the blossom end, scoop out the seeds, stand the tomatoes in a baking pan in the oven until they are partly cooked. Put a half teaspoonful of butter and a dusting of salt and pepper into the bottom of each, and break in one egg. Put these back in the oven until the eggs are "set." Have ready a round of toasted bread for each tomato, stand the tomato in the center of the bread, fill the bottom of the dish with cream sauce, and send to the table.