Preheat the oven to 375˚F.  Line a baking sheet with parchment paper or silicone liner. Cover and microwave asparagus (in some water) on high for 2 minutes. Separate the crescent roll dough into 8 triangles and lay flat on the baking sheet.  Spread a thin layer of the mustard on each triangle. Wrap two spears together in two slices of ham, then place at the wide end of a dough triangle and roll up the dough.