Cha gio: fried rolls - Aliette de Bodard

Ingredients

• 1 whole onion
• 1 taro root (can be replaced by 3 shredded carrots)
• 1 garlic clove
• 1 shallot, or 3 scallions (scallions is better, but harder to find)
• 500g filling (either minced pork, crab or shrimp–I use ⅔ pork, ⅓ shrimp)
• 6 nam meo, or wood ear mushrooms
• 70-80 g of bean thread vermicelli
• 2 eggs
• 2 teaspoons sugar
• 1 pinch of salt and 1 pinch of pepper
• 2 tablespoons of fish sauce
• Rice papers, 30-40