A hit during a hot summer when ripe tomatoes are plentiful.

1 English cucumber, halved lengthwise and thinly sliced
1 lb tomatoes, cherry, grape, heirloom, roma, etc. cut into bite-size pieces
1 shallot, thinly sliced
1/4c chopped parsley
juice from 1 lemon
1/4c olive oil
1/2c feta cheese, crumbled
salt and pepper to taste

Combine all ingredients except the feta and toss thoroughly.  Add feta and mix until combined.  Season with salt and pepper to taste.