2 tbsp. vegetable oil
1/2 tsp. salt
1/4 tsp. pepper
1 tbsp. vinegar
1 tbsp. sugar
1 tsp. minced parsley
1 med. cucumber, peeled and thinly sliced
2 med. tomatoes, sliced
1 lg. onion, sliced and separated into rings

Combine first 6 ingredients in a jar; shake well. Combine vegetables in a serving bowl. Pour marinade over vegetables; refrigerate 2 hours before serving.