In a large bowl, add all ingredients in order as listed and as you are preparing them (washing and chopping the vegetables).
Stir well and gently, and serve immediately or within a few hours.
Notes
Store: To make ahead, refrigerate all vegetables covered in a bowl, and add oils, salt and pepper right before serving (as soon as you add salt - salad "leaks").
Use garden's bounty or winter store's availability. Any type of cucumbers (pickle, dill, garden, long English, Persian), peeled or not, work.
Any type of full-grown, grape or cherry tomatoes work.
As for lettuce - Boston, red leaf, romaine, butter, green leaf are great. Just make sure to chop all vegetables in similar sizes.