3 salt baked yukon three butters Recipes

red potatoes (about 3/4 lb), baking potatoes (about 1 lb), yukon gold potatoes (about 3/4 lb), sour cream, butter, melted, green onions, thinly sliced, salt, pepper, sharp cheddar cheese, shredded, cold butter, cut up, paprika, garnish: green onion fans

kosher salt, yukon gold potatoes , scrubbed (about 4 1/2 lb), scallions, white and light green parts thinly sliced, dark green parts cut into 1-inch lengths, unsalted butter, softened (3/4 lb), table salt & freshly ground black pepper, grainy mustard, dijon mustard, drained prepared horseradish, fresh lemon juice (please not the bottled stuff!)