Prepare the chickpeas: In a saucepan, warm the chickpeas with some of their cooking liquid. Add the garlic, cumin, and a pinch of salt. Simmer for 10 minutes until fragrant.
Add the harissa: Stir in harissa to taste. Adjust with more liquid if you prefer a soupier consistency.
Prepare the bowls: Place torn bread pieces in the bottom of serving bowls. Ladle the hot chickpea mixture over the bread, allowing it to soak.
Add toppings: Drizzle with olive oil and lemon juice. Top with olives, capers, and eggs (if using). Season with black pepper.
Garnish: Finish with fresh parsley and serve immediately.