01 - Preheat the oven to 350°F.
02 - Arrange the barley rusks on a baking tray. Lightly sprinkle each rusk with a small amount of water to gently soften the surface without saturating.
03 - Bake for 7 to 10 minutes until the rusks are crisp and lightly toasted throughout.
04 - Remove from the oven and, while still warm, drizzle approximately 1 tablespoon of extra virgin olive oil over each rusk so it absorbs into the surface.
05 - Distribute the diced tomatoes evenly across each rusk, followed by a light sprinkle of the chopped red onion.
06 - Generously crumble feta cheese over the tomato and onion layer on each rusk, ensuring even coverage.
07 - Sprinkle dried oregano and freshly ground black pepper over the tops. Add a touch of sea salt if desired, keeping in mind the feta is naturally salty.
08 - Drizzle any remaining olive oil over the assembled rusks. Garnish with sliced Kalamata olives and fresh basil or parsley leaves if desired. Serve immediately while the rusks are still crisp.