01 - Preheat the oven to 425°F. Line a large baking tray with parchment paper.
02 - Peel all citrus fruits, removing as much white pith as possible. Slice each fruit crosswise into 1/2-inch thick rounds and arrange in a single layer on the prepared tray.
03 - In a small bowl, whisk together honey, brown sugar, vanilla extract, orange blossom water (if using), cinnamon, and cardamom until well combined.
04 - Drizzle the honey-spice mixture evenly over the citrus slices, ensuring all pieces are lightly coated.
05 - Roast in the oven for 20-25 minutes, or until the citrus is lightly caramelized and just starting to brown at the edges.
06 - Let cool slightly, then transfer to a serving platter. Garnish with chopped pistachios and fresh mint leaves before serving.