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Leek, Carrot and Potato au Gratin
Ingredients 3 Tbsp butter, divided 3 medium leeks, thinly sliced 2 cloves garlic, minced 2 Tbsp all purpose flour 11/2 cups whole milk 1/2 tsp salt 1/4 tsp black pepper 1/4 tsp dry mustard powder 2 sprigs fresh thyme (1/2 tsp dried) 3 large red or white potatoes (1 lb),…