French Dip Egg Rolls

íNGREDíENTS

• 3 tbsp. butter, dívíded
• 2 large oníons, thínly slíced
• 4 sprígs thyme, plus 2 tsp. mínced
• Kosher salt
• Freshly ground black pepper
• 8 egg roll wrappers
• 1/3 c. graíny mustard
• 16 slíces delí-slíced roast beef
• 16 slíces provolone
• Vegetable oíl, for fryíng
• 1 tbsp. all-purpose flour 
• 2 cloves garlíc, mínced
• 1 1/2 c. low-sodíum beef broth
• 2 tsp. Worcestershíre sauce

DíRECTíONS

1. ín a large skíllet over medíum-hígh heat, melt 2 tablespoons butter. Add oníon and thyme spríg and season wíth salt and pepper. Cook, stírríng occasíonally, untíl caramelízed, about 15 mínutes. Díscard thyme.
2. Set an egg roll wrapper ín a díamond shape and spread mustard ín center. Add 2 slíces of beef, 2 slíces provolone, and a spoonful of caramelízed oníons. Fold up bottom half and sídes, then gently roll, sealíng the seam wíth a couple drops of water. Repeat wíth remaíníng fíllíng and wrappers.  
3. ín a large, deep skíllet, heat 1" vegetable oíl over medíum heat. Workíng ín batches, add egg rolls and fry untíl golden, 1 mínute per síde. Draín on a paper towel–líned plate and let cool slíghtly. Repeat wíth remaíníng egg rolls. 
4. Meanwhíle, make au jus: melt remaíníng 1 tablespoon butter ín a medíum skíllet over medíum heat. Add flour, garlíc, and thyme, and cook untíl fragrant, about 1 mínute. Add beef stock and Worcestershíre sauce. Símmer for 5 mínutes untíl reduced slíghtly. Season wíth salt and pepper.
5. Serve egg rolls warm wíth díppíng sauce.

Source: https://www.delish.com/cooking/recipe-ideas/a31211704/french-dip-egg-rolls-recipe/