Onion Relish:
Toss together red onion, red wine vinegar and fresh oregano in a small bowl and set aside.

Maryland Blue Crab Cakes:
1. Heat 3 T. oil in a saute pan over medium high heat. Saute 1/3 cup minced green onions and minced celery until soft.
2. In a large bowl, mix cracker crumbs, 1/4 cup of minced green onions, egg, parsley, seafood seasoning and 1/2 tsp. salt. Add the sauteed onion and celery, then gently mix in the crab meat.
3. Form the crab mixture into eight cakes using a round mold or hands. Place the cakes, not touching, on a metal baking sheet. Broil the crab cakes under the broiler for about 4 minutes. Gently turn them over, careful not to break them, and broil on the other sides. At the end of 8 minutes, they should be nicely browned.

Assembling The Dish:
1. Heat a stovetop grill on medium heat.
2. Crown 8 semi-hard round buns by cutting off the rounded tops with a bread knife. If not already split, cut in half, lengthwise. Brush the outsides with olive oil.
3. On the inside of the top half of each bun, spread about 1 tsp. basil sauce and 1/2 T. onion relish. Place a crab cake on the inside of the bottom half of the bun.
4. Grill each sandwich for a minute or two per side, pressing down on the sandwich with an egg turner. The sandwich is done when lightly browned on each side.
5. Cut the sandwiches into two halves or quarters and serve.