Apparently you would put it on at night, you'd leave it on your skin overnight and then you wash it off with water, with chervil in it, which is a form of parsley.
Over the next century, the recipe was adapted by chefs across Europe, until eventually recipes emerged that were less spicy and more savory thanks to the introduction of garlic, parsley and basil.
If you're only growing herbs, this could be basil, cilantro, parsley, these types of things that you use to garnish your food, that would be an herb garden.