Spinach and Strawberry Salad

4 cups spinach, washed and stems removes
1/2 a red onion, thinly sliced
3/4 cup sliced fresh strawberries
1/4 c red wine vinegar
1/4 c vegetable oil
1 tsp sugar
salt and pepper

Whisk together vinegar, oil, and sugar and season with a little salt and pepper. Toss with spinach, onion, and strawberries. Mmmmmm!