Foundation Arrangement: Arrange the 6 whole barley rusks in a single layer on a large, shallow serving platter.
Aromatic Vinaigrette Emulsion: In a small bowl or jar, combine garlic paste, lemon zest, lemon juice, red wine vinegar, 5 tablespoons olive oil, and black pepper. Whisk or shake until emulsified.
Core Ingredient Maceration: In a large mixing bowl, combine tomatoes, chickpeas, cucumber, and red onion. Pour over the vinaigrette, toss to coat, and let stand 10 minutes.
Herb & Brine Integration: Fold in parsley, basil, mint, dried oregano, olives, and capers until just combined.
Assembly & Rusk Hydration: Spoon the entire mixture with all juices evenly over the rusks. Rest 10 minutes to soften. If rusks remain too firm, drizzle 1–2 tablespoons water or extra tomato juices over each and wait 5 minutes.
Final Garnish & Presentation: Crumble feta over the top and finish with a light drizzle of olive oil. Serve immediately.