Ingredient:

• ¼th small red onion, very thinly sliced
• 4 blood oranges (or regular oranges), peeled and sliced ¼-inch thick
• 1 large or 2 small-to-medium ripe avocados, thinly sliced
• 2 tablespoons fresh lime juice (about 1 medium lime)
• Flaky sea salt or kosher salt
• 1 teaspoon nigella seed, black sesame seeds* or pepitas (green pumpkin seeds)
• ¼ cup fresh cilantro leaves
• 2 tablespoons extra-virgin olive oil