A fresh 20-minute take on the classic pairing of salmon and citrus

Ingredients

• 1/4 medium red onion
• Handful fresh mint leaves (about 1/4 ounce)
• 1 large grapefruit, preferably red (may substitute pomelo or sections from 2 large limes)
• 1 large navel orange
• 1 teaspoon sugar
• 1/4 to 1/2 teaspoon crushed red pepper flakes (may substitute piment d'espelette for a fruity, less-intense heat)
• 1/4 teaspoon kosher salt, or more as needed
• Two 6-ounce skin-on salmon fillets, preferably centre-cut
• Extra-virgin olive oil
• 1/4 teaspoon freshly ground black pepper