Drain the artichokes and reserve all the marinade. You should have approximately ½ cup. If not, add olive oil to make ½ cup.
Combine the artichoke hearts (chop if desired), the drained and rinsed beans, red onions, capers and oregano. Toss to combine.
Pour the reserved marinade over the artichoke/bean combination.
Add red wine vinegar and lemon juice to taste.
Add the tuna and gently toss.
Add more red wine vinegar and lemon juice along with salt and black pepper to taste.
Serve with sliced or torn lettuce, spinach or arugula and lemon wedges. Garnish with a few slivers of red onion.
