Its all about balance.
Romaine lettuce, lot of coriander, chopped onions with yellow or red capsicum. After you wash these drain out every single drop of water. Anything left in them will dilute the dressing and make it soggy.
For the dressing take the juice of one lemon and add approximately three times its quantity of extra virgin olive oil to it. Season with salt and pepper. Flavor it with finely chopped garlic.
Takes less than 10 mins to make a super yummy summer salad.