Sweet Potato Casserole with Pecan Crumble and Meringue

Bring a large pot of water to a boil. Chop the Sweet Potatoes (3) , then throw them in. Cook for 15 to 20 minutes, or until fork tender, then drain. Mash until smooth then add Butter (1/4 cup) , Milk (1/4 cup) , Vanilla Extract (1 tsp) , Ground Cinnamon (1/2 tsp) , and Salt (1/4 tsp) . Stir until combined and set aside until cooled (room temperature), then stir in the yolk from the Eggs (4) .(reserve the whites).