Mash the chickpeas: Add the chickpeas to a mixing bowl and use a fork or potato masher to roughly mash. Aim for a mix of creamy and chunky for the best texture.
Add the avocado: Scoop the avocado into the bowl and mash it into the chickpeas until the mixture holds together but still has some small pieces.
Flavor it up: Add lemon juice, Dijon, red onion, celery, herbs, and garlic (if using).
Drizzle in olive oil if you want a silkier mash.
Season: Sprinkle with salt, pepper, and red pepper flakes or hot sauce to taste. Stir well and adjust lemon or salt until it pops.
Toast the bread (optional): Toasting adds structure and a nice crunch. This is especially helpful if your bread is soft.
Assemble: Spread a generous layer of mash on your bread.
Add toppings like lettuce, tomato, cucumber, pickles, or sprouts.
Close and serve: Top with the second slice of bread. Slice in half and enjoy right away.