(Can fully assemble the day before) Place yams in a large pot of boiling water. bring to the boil and boil for 30-40 minutes or until very fork tender. Then, drain water and peel yams when cool enough to touch.
Butter a 8x8 square dish. Slice yams into ½” rounds and layer one layer in the baking dish. Then drizzle with honey, sprinkle with a tablespoon of brown sugar and sprinkle with generous cinnamon and just a little cloves and nutmeg.
Repeat with 2-3 more layers in the same way. Then cover with plastic wrap and place in fridge if serving the next day.
When ready to serve place in the oven for 20-30 minutes at 350 F. Then turn oven up to high broil. Place marshmallows scattered on top. Broil for 5 minutes or so or until marshmallow turn golden brown (don’t walk away- they burn easily!) Now it’s ready to serve.