Pate with Mushrooms (Or Mushrooms) and red wine

Ingredients

• 200 grams mushrooms
• 50 milliliters red wine (Mencia Rectoral de Amandi barrel) (DO Ribeira Sacra)
• OR 50 ml of Albariño white wine (Gran Alanis) (DO Ribeiro)
• 1/4 sweet onion or 1 shallot
• 1 pinch salt
• 1 pinch ground black pepper
• 30 grams Galician artisan butter (Campo capela or Airas moniz)
• 2 tablespoons Alma Meiga olive oil