BAKE bread according to instructions on the package. Let cool completely and slice into 1 inch slices.
ADD chickpeas to a large bowl and mash using a fork. Add hummus, red onions, capers, pickling juice, salt, pepper and cayenne. Mix well.
TASTE and adjust seasonings. Set aside.
To Make the Sandwiches:
SPREAD about 1 teaspoon of mustard on one slice.
SCOOP 1/3 cup of the chickpea mix on the prepared slice. Top with a few slices of avocado and cucumber and finally with a handful of arugula and sprouts. Top with a second slice of bread.