Really good Hot Fudge

Laura’s Yummy 10 Tbls Butter 6 Tbls Coco 2 eggs 1/2 Cup Boiling water 2 tsp Vanilla In a double broiler on Low heat 4 or 5 Melt butter add Coco then blend in sugar beat eggs slightly before you add stir swiftly add 1/2 cup water Stir Well turn down on low and Cook 10 min add Vanilla