Do not peel the tomatoes, but remove cores. Stand each tomato on a salad plate. Cut vertically into thin slices and then push the slices over so that they lean one against the other.
Put garlic in the salad bowl, mash to a pulp with wooden spoon, and then discard the pulp. Add salt, pepper, oil, and vinegar. Mix well together. Stir in mustard, parsley, and ch