01 - Preheat oven to 350°F (180°C). Line a baking tray with parchment paper if desired.
02 - Arrange the barley rusks on the baking tray and toast for 8–10 minutes until deeply crispy and lightly golden.
03 - Remove the rusks from the oven and lightly drizzle about 1 tbsp of olive oil across the surface of each rusk to gently soften the top crust.
04 - Spoon the finely diced tomatoes evenly over each rusk, pressing gently so they settle into the surface.
05 - Generously crumble feta cheese over each rusk, ensuring even coverage across the tomato layer.
06 - Drizzle the remaining olive oil over the assembled rusks. Sprinkle with dried oregano and freshly cracked black pepper.
07 - Top each rusk with sliced kalamata olives and capers if using. Finish with chopped fresh parsley for a burst of color.
08 - Arrange on a platter and serve immediately while the rusks are still warm and crunchy for the best texture contrast.