Step 1

Place the chickpeas, vegan mayo, mustard, vinegar, dulse, celery seeds, celery, black pepper and cayenne pepper into a food processor.

Step 2

Pulse a few times until incorporated and minced. Careful not to over-blend; you shouldn't be pulsing more than 20 seconds.

Step 3

Lightly toast your bread, then fill each sandwich with lettuce, chickpea "tuna" mash, tomato and onion.

Step 4

If you plan on packing the sandwich for later, wrap it tightly in parchment paper to keep the filling intact.