Arugula Sandwiches with Smashed Chickpea Salad

0 Make the Chickpea Salad: Add the hummus, and lemon juice to a medium bowl and whisk well, until combined. Add the sun-dried tomatoes and chickpeas to the bowl and use a potato masher or fork to mash at least half of them, or more to your liking. Use a spatula to fully mix the chickpeas into the dressing. The mixture should be slightly wet and hold together; if not, add more hummus in 1 tablespoon increments. Fold in the fresh herbs and set aside.
1 Arugula Salad: Whisk the lemon zest (if using), lemon juice, and olive oil together in a separate bowl with a generous pinch of salt and pepper., Add the arugula on top and fold it into the dressing. Note: this might look like a lot, but don’t worry – it’ll smoosh down!
2 Assemble the Sandwiches: Toast or pan-fry the bread to your liking. Add a thin layer of mustard to one side of the bread (or both if you are obsessed with mustard like me). Add the cucumber, red onion, and avocado (if using) to   the bread, then pile on half of the chickpea salad and arugula. Add the final piece of bread on top, and your sandwich is complete; repeat with the other two slices. These sandwiches are pretty stacked, so I recommend wrapping them in parchment paper, then slicing in half for easier eating. Enjoy!