Preheat oven to 425°. Cut four pieces of parchment paper into heart shapes, about 12-15″ at its widest part. Combine sauce ingredients and mix veggies with sauce, like dressing a salad. Put a handful of veggies in center of parchment paper and then top with grouper. Add 1 oz. butter and scallions. Fold the heart of parchment paper down the center and close by tightly folding edges. Cook for about 15 minutes.
Be careful when opening packet – steam will be hot!