Patty Melts with Apple Slaw

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1/2 small head red cabbage, shredded (about 3 cups)

1 small Granny Smith apple, cut into matchsticks

1 cup shredded carrots

2 scallions, thinly sliced

1/4 cup dijonnaise (or dijon mustard mixed with mayonnaise)

2 tablespoons apple cider vinegar

Kosher salt and freshly ground pepper

2 tablespoons unsalted butter

1 onion, sliced

12 ounces extra-lean ground beef sirloin

4 thin slices light Swiss cheese (about 3 ounces)

8 slices rye or marble rye bread