1 1/2 Tablespoons of poppyseeds
3/4 cup white vinegar
1 1/2 cup oil
3/4 cup sugar
1 1/2 tsp salt
3/4 tsp dry mustard
1/2 of purple onion, thinly sliced.
Combine all ingredients (except onion) and pour over the sliced onion in a container with a lid. Let sit overnight in your refridgerator. remove onion slices and serve. Great with spinach salad.