I won't claim this is the best, but it is my favourite tuna sandwich.

Using a bread machine I make this bread:
11.5 floz water
3 tablespoons olive oil
8oz canned chickpeas (drained)
1.5lbs mix of white & brown bread flour
3 cloves garlic (finely chopped)
1 teaspoon paprika and a couple of dashes of Cholula/tabasco sauce
2 tablespoons milk powder
2 teaspoons salt
1 tablespoon sugar
1.5 teaspoons dried yeast


I mix tuna with mayonnaise, smear it on a slice of the bread.
On top of this I add a layer of sliced pickled beetroot.
Some rocket.
Another slice of bread.
Cut in half and gorge myself.