Brush olive oil on the dough.
Scrape the mentaiko out of its membrane.
Mix mayonnaise, mentaiko, and lemon juice to make the sauce.
Spread the mentaiko mayo sauce over the dough.
Top with mozzarella cheese.
Bake in a preheated oven at 200°C for 8 to 10 minutes.
Garnish with black pepper and chopped scallion to finish.