Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      large         red onion -- sliced 1/4" 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                    garlic clove -- 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                    tuna steaks - -- (6 oz ea)
   2      bunches       rucola -- washed, stemmed,
                        and spun dry
                        salt -- to taste
                        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".