Marinated mushrooms, B*ylis style

This is how my parents always make their marinated mushrooms. I'm guessing the recipe probably originated from my grandparents, but no clue where it came from before that.
All I know is that Ernie loves mushrooms, and he loves it when I marinate them like this.
  • 1 pound mushrooms
  • 2/3 cup olive oil
  • 2/3 cup red wine vinegar
  • 1 shallot or scallion, minced
  • 1 tsp. salt
  • 1 dash pepper
  • 1 cup red wine
  • 2 garlic cloves, smashed
Combine all ingredients. Heat in a saucepan, but do not boil, for about 15 minutes. Remove and cool. Place the mushrooms and the marinade in the fridge for several hours before serving.