French Onion Tart Cups (Dean from WGN)

wgntv.com

Crystal Allen

1 ½ lb. onions (about 4 small), preferably yellow, halved, thinly sliced

3 Tbsp. unsalted butter

¾ tsp. Diamond Crystal or ½ tsp. Morton kosher salt, plus more

1 garlic clove, finely chopped

2 tsp. sherry vinegar or red wine vinegar

2 tsp. Worcestershire sauce

1 tsp. freshly ground pepper

4 oz. Gruyère, coarsely grated, divided

1 sheet frozen puff pastry (one 14-oz. package or half of a 17.3-oz. package), thawed

1 Tbsp. Dijon mustard

Chopped chives (for serving)

Directions at wgntv.com

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