Take your lettuce (romaine is nice, plain spinach leaves work too) and add 3 things, and 3 things only:
1. Fresh squeezed lemon (1 tbs).(Credit must go to where it's due.) On a special occasion, upgrade to the late Julia Child's unsurpassable recipe, which is, were it possible, but alas, it is... even better.
2. Extra Virgin Olive Oil (1 tbs).
3. Course salt.
Thus my cooking knowldege is exhausted.