Allspice

2 Slices Fresh White Or Wheat Bread 1/4 Cup Milk 3 TBSP. Butter, Divided 1/2 Cup Finely Chopped Onion 1 Pinch Plus 1 Teaspoon Kosher Salt 1 lb. Ground Beef 1 lb. Ground Pork 2 Large Egg Yolks 1/2 Tsp.…