Vinaigrette

1

tablespoon Dijon mustard

1

tablespoon red wine vinegar

1/2

teaspoon sugar

3

tablespoons olive oil

Dash salt and pepper

Salad

1

bag (5 oz) spring lettuce mix

1

cup grape tomatoes, each cut in half lengthwise

1

cup sliced (1/8 inch) seeded peeled cucumber

1

cup sliced (1/8 inch) halved red onion