Frog's Legs with Garlic Purée and Parsley Jus - Original recipe by French Chef Bernard Loiseau. Frog's legs with garlic and parsley are a traditional Burgundian dish. However, as Bernard Loiseau said, they are usually are drowned in butter, with a garlic taste that lingers long after. Therefore, he tried reducing the butter in this recipe, with astonishing results, both in flavor and lightness.