Mmm, Mmm good.

A basic Vinaigrette is 4 parts oil to 1 part vinegar.
I used Canola oil, and Apple Cider Vinegar. And added brown sugar and lemon juice to taste.
The reason I used spinach because it holds sweet flavors best. Romaine holds creamy savory dressings best, and iceberg is best for sandwiches and casual salads for all other dressings.