Cucumber and tomato salad

1/3 cup red wine vinegar

1 Tbsp sugar

1 tsp sea salt

2 medium cucumbers, peeled and sliced thin

 2 medium tomatoes , diced

1 medium onion, sliced

2 tbsp olive oil 

Black pepper and additional salt to taste

Mix together vinegar, salt, and sugar in mixing bowl. Add cucumber slices. Toss to coat. Set aside for at least 1 hour, stirring occasionally. 

Add tomatoes, onion, oil, salt and pepper. Stir to mix