Drain the chickpeas into a colander and rinse under water, then shake off any excess water, transfer the chickpeas into a large bowl and using a potato masher or large fork, mash down on the chickpeas until they're semi-mashed, meaning it's ok if you have little chunks of chickpeas
Add the Greek yogurt over the mashed chickpeas, along with the dijon mustard, red onion, garlic, parsley, lemon juice and season with sea salt & black pepper, mix together until well mixed, add in more yogurt if your mixture is too dry
Lightly toast the slices of sandwich bread
Add the chickpea salad over the slices of toast, top off with slices of tomato, shredded iceberg lettuce and another slice of toast, enjoy!
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