Low Carb Cream of Shiitake Mushroom Soup

INGREDIENTS

• 1/2 lb shiitake mushroom, thinly sliced
• 1/2 medium onion, sliced
• 1/4 lb butter
• 1 quart chicken stock
• 1 quart beef stock
• 3 tablespoons toasted sesame seeds, crushed
• 1/2 teaspoon seasoning salt
• 1 cup heavy cream
• 1 tablespoon minced chives (or scallions)
• pepper