Steam the bao buns in a steamer for about 6-8 minutes, or until completely soft. If you don't have a steamer, use a heat-resistant strainer placed over a pot of simmering water, and cover with a lid. Make sure the bottom of the buns don't touch the water.
Grate the mozzarella cheese or tear it into smaller pieces. Tip: If it's too moist, pat it dry with paper towels to prevent it from making the buns soggy later.
Toast the pine nuts in a dry skillet over medium heat for 2-3 minutes, stirring constantly, until golden brown. This will enhance their nutty flavor.
Carefully open the steamed bao buns, being careful not to tear them. Spoon in a portion of basil pesto, then sprinkle with mozzarella and toasted pine nuts.
Place the filled buns on a baking sheet lined with parchment paper and bake in a preheated oven at 350°F (180°C) for 5–6 minutes, or until the cheese is melted and bubbly. Be careful not to overbake, or the buns may dry out.
Before serving, drizzle with a little olive oil and season with salt and pepper to taste. Serve fresh and warm, when the cheese is still stretchy and the pesto is intensely fragrant.
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