Grease a 12-cup muffin tin; set aside.In a small saucepan, stir milk, sugar, and 2 tablespoons butter together. Heat over low heat just until butter melts and sugar dissolves. Cool to about 100-105 F.Pour the milk mixture into the bowl of a stand mixer.Add the yeast and warm water. Let stand for 5-10 minutes, or until yeast is foamy.Add 2 cups flour and salt to yeast mixture. Using a dough hook, mix on low speed for about 1 minute.With the mixer still going, add remaining flour, 1/2 cup at a time. Mix about 1 ½ minutes, or until dough starts to clean the sides of the bowl.Knead on low speed for about 2 more minutes, or until dough is smooth and elastic – the dough will still be slightly sticky to the touch.Place dough in a greased bowl, turning it to grease the top. Cover the dough with a clean, dry dish towel.Let it rise in a warm place, free from draft, for about 15 minutes.Turn the dough onto a lightly floured surface, and divide into 12 equal pieces.Form each piece into a ball and cut each ball into thirds.Place 3 dough balls in each muffin cup.Cover the muffin pan with the dish towel, and let the dough rise for about 15 minutes.Melt remaining 2 tablespoons butter. Set asideBake at 425ºF for 9-12 minutes, or until the rolls are golden brown.Brush rolls with melted butter.Remove from pans, and cool on wire racks.