Add the pepper and some onions (optional),then microwave for a minute or dry cook until warmed thru.

After that add mayonaise and stir,make a paste.try not to overdo the mayo

Slice the baton bread in the middle and lenghth wise. Warm up bread (optional).Spread butter on the button bread,then spread the semi cooked tuna paste evenly and thick layer then,add the choped herbs eg corriander or parsley etc or celery florets

Then layer the cucumber halves and tomatoes slices see pic,then the rocket along the centr

Bismillah enjoy (can have it warm or cooled in fridge)