Moules Marinière - Jumping Pumpkin

Ingredients

• 2.2 lbs black mussels (1 kg)
• ½ onion
• 1 clove garlic
• ½ cup white wine (dry, possibly Sauvignon Blanc, about 100-120 ml)
• 3 tbsp butter (40 g)
• 3 tbsp parsley (fresh, chopped)
• 3 tbsp celery leaves (fresh, chopped)
• ground black pepper