Grilled Tuna with Borlotti, Onion Pickles, and Pepper Mustard

Grrrrrgh!
Course : Italian
From: HungryMonster.com
Serves: 4
 

Ingredients:

1 large red onion -- sliced 1/4 inch thk rounds
1/2 cup red wine vinegar -- plus
4 tablespoons red wine vinegar
1 tablespoon balsamic vinegar
1/2 cup water
1/4 cup sugar
2 tablespoons salt
1 cup cooked cranberry -- (borlotti) beans
2 tablespoons finely-chopped fresh thyme leaves
1 clove garlic -- thinly sliced
3 tablespoons extra-virgin olive oil -- plus
1/4 cup extra-virgin olive oil
1/4 cup dijon mustard
1 tablespoon cayenne pepper
4 fillets tuna steaks - -- (6 oz ea)
2 bunches rucola -- washed, stemmed, and spun dry
1 teaspoon salt -- to taste
1 teaspoon freshly-ground black pepper -- to taste
 

Preparation:

Preheat grill or broiler In a mixing bowl, place sliced onion, 1/2 cup red wine vinegar, balsamic vinegar, 1/2 cup water, sugar and 2 tablespoons salt and mix well. Allow to stand 1 hour, drain and set aside. Mix cranberry beans, thyme, garlic and 3 tablespoons extra-virgin olive oil and set aside. In blender, mix Dijon mustard, cayenne, remaining 4 tablespoons red wine vinegar and 1/4 cup extra-virgin olive oil until smooth, remove and set aside. Rub tuna steaks with salt and pepper and place on grill or under broiler and cook until medium-rare (about 3 to 4 minutes per side). Toss arugula with bean mixture to coat and divide among 4 plates. Place pickled onion rounds around border. Place hot tuna in center of plate, drizzle with the mustard sauce and serve. Season lightly with salt and pepper. Comments: The original recipe title as listed is "Grilled Tuna With Borlotti, Onion Pickles, Arugula And Red Pepper Mustard".