Mustard Salmon Sheet-Pan Dinner

lemon, sliced thinly

lemon, juiced

grainy mustard

dijon mustard

fresh dill, chopped and divided

Kosher salt and freshly ground black pepper

filet steelhead or King salmon, skin on

small new potatoes (red or white)

thin stalk asparagus, woody stems removed

garlic, peeled, left whole and smashed with the side of a knife

olive oil