Pigs and Mustard Greens in a Blanket

Name: Pigs and Mustard Greens in a Blanket
Ingredients: Kosher salt; 1 pound mustard greens, cleaned; 2 tablespoons unsalted butter; 1 tablespoon grapeseed oil; 3 shallots, finely chopped; 5 cloves garlic, finely chopped; 1 jalapeno, seeded, finely chopped; 1 tablespoon fine cornmeal; 1/4 teaspoon cayenne pepper or 1/2 teaspoon red chile flakes; 1 tablespoon Dijon mustard; 1 tablespoon Japanese mayonnaise, such as Kewpie; 2 cans crescent rolls, such as Pillsbury; 48 cocktail-size smoked links; 1 stick (8 tablespoons) unsalted butter, melted; Black mustard seeds, for sprinkling; Smoked flaky sea salt, such as Maldon; 3/4 cup Dijon mustard; 1/4 cup Japanese mayonnaise, such as Kewpie; 2 teaspoons freshly ground horseradish; 1/2 teaspoon kosher salt; 2 tablespoons chopped fresh chives