La Bonne Soupe in Midtown NYC has an absolutely scrumptious house dressing, a lightly garlicky vinaigrette with just the right tang of Dijon mustard and emulsified to creaminess. I can never resist mopping up the last drops with French bread. I've never bought a bottle (sold only at the restaurant) but the the label lists chicken broth as an ingredient, which sounds pretty strange but must add richness.