01 - Preheat oven to 350°F (180°C).
02 - Arrange the barley rusks on a baking tray and toast for 8–10 minutes until deeply crisped throughout.
03 - Remove rusks from the oven and lightly drizzle about 1 tbsp of olive oil across the tops to soften just the surface without making them soggy.
04 - Spoon the finely diced tomatoes evenly over each rusk, pressing gently so they adhere.
05 - Generously scatter crumbled feta over each rusk, covering the tomato layer.
06 - Drizzle the remaining olive oil over the assembled rusks, then sprinkle with dried oregano and freshly cracked black pepper.
07 - Top each rusk with sliced kalamata olives, capers if using, and a scatter of chopped fresh parsley.
08 - Serve immediately while the rusks are still crunchy for the best texture contrast.