A ham sandwich is infallible. Whatever your choice - cucumbers, lettuce, peppers - they will always bring out the taste, while the ham brings out the crisp. But there’s a trend here, no? Go green for best results.
Ingredients: Turkey ham (sliced), butter, bread, a green additive (cucumbers, peppers, lettuce, parsley, spring onion etc)
Although, here’s an alternative twist to the green in your pink - a Turkish pistachio idea. Replace any green with pistachio nuts, to give a twist to the taste and colour palette.
Here we have the benefit of the tasty ensemble, but a sprinkle on top goes just as well. Get the butter on the bread, the ham, and improvise.
That seems perfectly sustainable.