Blackened Fish Po' Boy with Grilled Green Onion Mayonnaise

CSA Produce: Green Onions, Arugula, Basil
Healthy, Quick
Serves 4-6

Sandwich Ingredients:

4 - 6 to 8 ounce fish fillets
tbls olive oil
tbls red hot blackened seasoning
4 - 6 inch baguettes
2 cups chopped arugula

Grilled Green Onion Mayonnaise Ingredients: 
8 green onions/ scallions
Olive oil (for brushing)
Salt and pepper to taste
1/3 cup mayonnaise
Grated zest and juice of one lemon
2 tsp chopped fresh basil

Directions:
To make the mayonnaise: Medium hot grill, place perforated grill rack over the grill grate.  Brush the onions with olive oil and season with salt and pepper. 
Put on grill and turn every minute or so so the onions get good grill marks, let cool
Chop grilled onions and mix with the rest of the ingredients. 
Serve right away or put on the fridge for up to 3 days.  I like it in the fridge for at least an hour so the flavors have a chance to really mix.

For the sandwich: Turn grill up to hot heat, rinse fish and pat dry, brush with olive oil and bsprinkle with the blackened seasoning.  (they have some great recipes online to make your own blackened seasoning but you can find a pre made variety in the spice section of your local grocery store)
Grill fish for 3-4 minutes on each side, turning only once.
Transfer fish to flat surface and cut the fish into chunks with fork ( you can use whole fillets depending on the size of your fish.
Spread mayo on bread sprinkle arugula and place fish on top.
Serve and enjoy.