As chef de cuisine of the celebrated restaurant Voisin on the rue Saint HonorÃ , Choron is best known for his invention of Choron sauce , a bÃ arnaise sauce enriched with tomato concentrate . As chef de cuisine of the celebrated restaurant Voisin on the rue Saint HonorÃ , Choron is best known for his invention of Choron sauce , a sauce bÃ arnaise enriched with tomato concentrate before reduction .