Pre-heat the oven to 350 degrees Fahrenheit.
Place bottoms of buns on a cookie sheet or rimmed pan.
Place a meatball or 2 on each bun depending on the size of the buns and meatballs.
Top with a spoonful of the sauce from the crock pot.
Sprinkle with mozzarella cheese.
Place pan in oven and bake for about 10-15 minutes, or until cheese is melted and bubbly.
While the meatballs and bottom buns are cooking, mix the melted butter with the Datil Zest.
Remove tray from oven and place top of buns on meatballs.
Brush the top of the buns with the melted butter and return to the oven for about 5 minutes.
Remove from the oven and place the desired amount of alfalfa sprouts on top of the meatballs. Replace top bun and serve.
