"What would you like for breakfast?" I ask Mab

"I'd like some tuna, mixed with onion and salad cream grilled under cheese"

OK says I and down to the galley I wiz.

One can of tuna drained and scooped into a bowl with half of a finely chopped onion and a good dollop of salad cream all mixed together. (Ideally I'd have used a red onion, but made do with a white one)

One onion bagel sawn in half goes into the toaster. When it pops out pile a load of the fishy mixture onto the lower half and give it a good twist of black pepper. Then pile some grated cheddar on top and bung under the grill til it melts.

And there was enough filling for three people.