Marinated Mushrooms - cooking recipe

Ingredients

3 (4 1/2 oz.) cans mushrooms
1/3 c. vinegar
1/3 c. oil
2 tsp. parsley flakes
1 Tbsp. dried mustard
2 Tbsp. sugar
1 small onion, cut up
salt

Preparation

Combine all but the mushrooms; cook for 5 minutes on medium to medium-high.
Add mushrooms; simmer for 2 minutes.
Put in bowl; cover tightly and chill for several hours or overnight.
Stir a few times.