In a medium bowl add chickpeas and mustard and mash together with a potato masher. You want the chickpeas to still be chunky yet not perfectly round. Don't over mash or you will end up with hummus!
Add in onions, carrots, sea salt and pepper and stir together
Spread hummus on toast and add cucumbers on to one side and spinach on the other
Add a generous serving of chickpea of the sea salad and place toast together