Grandma's Cucumber Salad

3 Med. Cucumbers Peeled and Sliced 1/4"

1 Med. Onion sliced and separate into rings

3 Med. tomatoes cut into wedges

1/2 C. Vinegar

1/4 C. Sugar 

1 C. water

1/4 C. olive oil

2 tsp.salt

1 tsp. ground pepper

Combine all in a large bowl, toss making sure everything is coated well. Refrigerate for at least 2 hrs before serving