Mozzarella Panini with Pressed Apricot & Pickled Red Onion | culture: the word on cheese

Ingredients

• 1 red onion
• ¾ cup rice vinegar
• 6 tablespoons sugar
• 1 tablespoon kosher salt
• 1 loaf black olive ciabatta
• 1 ball (1 pound fresh mozzarella)
• ½- to ¾- pound wedge pan de orejon (apricot-almond cake)
• Kosher salt (to taste)
• Freshly ground black pepper (to taste)
• Extra-virgin olive oil (for brushing)