1. Mix oil and vinegar in a bowl and season with pepper to form a dressing.
2. Slice tomatoes and place with the feta in the dressing. Allow to marinate for 10 minutes.
3. Arrange tomato and feta on a salad platter or place in a salad bowl, with the origanum scattered in between.
1. Use a combination of large and baby tomatoes for an interesting look.
Add mint or parsley with the origanum, or as an alternative.
3. Add thin slices of cucumber for a variation.