Drain chickpeas (reserve liquid in the can) and add to a mixing bowl. Mash with a fork until desired texture. Mash slightly if you like it chunkier or mash it more if you prefer it creamier.
Add tahini, dijon mustard, dill, garlic powder, aquafaba, salt and pepper to mixing bowl. Stir to combine with mashed chickpeas. Taste and adjust seasoning as needed.
Toast bread and prepare the rest of your sandwich toppings.
Assemble your sandwiches by spoon a generous amount of chickpea salad onto two of the slices of bread, add slices tomatoes and lettuce, then top with the other two slices of bread. Enjoy!