Maille knows mustard. They've been around for hundreds of years and their quality cannot be topped. When you're in Paris, a must stop location is at 6, place de la Madeleine. It's a quaint shop with all things Maille. To tidy us over when we're not in Paris, there is the US version of Maille's Dijon mustard. It's a bit watered down from the originally potent concoction, but still very tasty. I usually use it when I make vinaigrettes for salads (also yummy w/ salmon).