Drain and rinse the canned chickpeas then transfer them into a large container with low edges such as an oven dish or into a large mixing bowl and mash them with a fork. Tip: It's easier to mash the chickpeas in a flat container like an oven dish than in a bowl.
Add the rest of the ingredients: vegan mayo, soy sauce, mustard, blended nori sheets, chopped red onion, chopped celery, chopped parsley, chopped capers, lemon juice, salt, and pepper.
Mix with a fork until all ingredients are well combined. Taste and adjust for salt.
Serve in a sandwich, on toasted bread, as a starter, on a baked potato, or eat as is as with a side of lettuce leaves as a salad.