Cut the tomatoes into thick slices (about quarter of an inch thick, which is just a bit under a centimeter). Remove the cores from the slices.

Arrange the slices on a serving plate.

Cut the shallots into pieces. For an authentic recipe, they should be coarsely cut, but many people prefer finely cut. Sprinkle the shallots over the tomato slices.

Mix the vinegar and olive oil together and then pour over the tomatoes.

Put the serving plate on the table with a pair of spoons,  so guests can help themselves.