Combine:

3/4 c. salad oil
1/4 c. fresh lemon juice
2 tbsp. grated Parmesan cheese
3/4 tsp. salt
1/4 tsp. granulated sugar
Dash of pepper
Dash of paprika
2 cloves garlic, halved

Prepare dressing ahead of time and refrigerate. (I like to slice fresh mushrooms and marinate them in the dressing). In a large bowl - break up fresh spinach. Add sliced red onion. Toss with Parmesan dressing.