Soak the red onions in cold water for ½ an hour, then drain
Slice the Focaccia horizontally. Spread the tapenade over the bottom piece, then cover with lettuce, tomatoes, feta cheese, cucumber and red onion
Sprinkle with salt pepper and oregano or mix vinegar and olive oil, and put into a side container
Wrap, and transport the sandwich to your picnic whole, then take off the top slice of focaccia and drizzle the sandwich with the oil and vinegar mixture
Replace the bread, and cut the sandwich into 3 or 4 pieces.
