Air Fryer Sweet-and-Sour Meatballs

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For the Meatballs:

1 pound ground beef

1/4 cup panko

3 tablespoons milk

1 large egg

1/2 onion, grated

1 tablespoon chopped fresh rosemary

1 teaspoon kosher salt

1 teaspoon freshly ground pepper

For the Sauce:

1 cup lingonberry or red currant jam

1/2 cup sweet chili sauce

1/4 cup balsamic vinegar