Remove the outer leaves from the romaine lettuce. Remove remaining leaves from the stalk, wash, cut into strips and drain. Rinse corn and beans, also drain. Clean, wash, quarter and seed the tomatoes.
Cut the flesh in half. Peel onions and cut into rings. Cut feta into cubes. For the marinade, wash the lime and grate the peel. Halve lime, squeeze juice. Mix vinegar, lime juice and zest.
Season with salt and chili. Gradually add the oil. Mix prepared salad ingredients and marinade. Serve portion by portion garnished with parsley.