Pastrami with Sauerkraut, Gruyère, and Whole-Grain Mustard Sauce

You’ll recognize this sandwich as a Reuben—with a few adjustments. Chief among them: We believe that mustard is the perfect condiment to cut the salty, sweet richness of cured meats, so we’ve replaced the Reuben’s more prosaic Russian dressing with an easy-to-make mustard sauce. Using really good pastrami sets the tone for the entire sandwich. While the meats you typically find in a supermarket are injected with water, an artisanal product is simply cured, then smoked with real wood chips, concentrating rather than diluting the flavors. And though the product is more expensive, you’ll need far less of it. You can try this sandwich with corned beef, too, especially if you’re in the mood for a milder and less smoky experience.