Preheat the oven to 375°F.
Peel and cube sweet potatoes into even pieces, then boil till fork tender.
In a mixing bowl, blend melted browned butter, brown sugar, vanilla extract, cinnamon, nutmeg, allspice, lemon juice, hot water and salt to create the glaze.
Toss sweet potatoes in the glaze until well-coated.
Arrange potatoes in a single layer in the casserole dish.
Cover with foil and bake for 40 minutes until they are fork tender.
Remove foil, top with marshmallows, and bake for another 10-15 minutes until marshmallows are golden.
Serve warm and enjoy!
