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Thaw the cockle meat, rinse in cold water, and drain.
Finely chop the red onion, soak in cold water for about 5 minutes to mellow the bite, then drain.
Mix 2 tsp olive oil, 1 tbsp lemon juice, minced garlic, salt, and pepper to make the dressing.
In a mixing bowl, combine the chickpeas, cockle meat, red onion, and parsley, pour in the dressing, and toss well.
Mix the Greek yogurt with lemon zest and salt to make the lemon yogurt.
Toast the sourdough until crisp, spread with the lemon yogurt, and top with the salad from step 4.