Potted Shrimp
Tiny brown shrimps potted in spiced butter under a clarified cap, melted out onto brown bread: the Morecambe Bay potting trade since 1799, lifted into a sandwich.
UK
Potato Bread Sandwich
Northern Irish fadge is a flat potato farl griddled cold off the board, soft inside with a chalky flour crust, and two slabs standing in for bread is the sandwich the Ulster fry is built around.
Pork Scratching Sandwich
The pork scratching sandwich tips a Black Country bar snack onto buttered white bread: hard fried rind, a seam of warm fat that smears into the crumb, a slice that slows a salty handful into lunch.
Pork Pie Sandwich
Sliced pork pie (pork in hot water crust pastry) on bread; picnic combination.
Pork Luncheon Meat and Salad
Luncheon meat with lettuce and tomato.
Polony Sandwich
Polony is the cheapest cold cut in Britain, a bright-red emulsified sausage on buttered white, a worn-down "Bologna" with no Polish in it, the same pink slice that built South Africa's kota.
Poached Salmon Sandwich
The poached salmon sandwich is salmon cooked just to setting in barely-trembling water, cooled and laid on buttered bread in soft whole flakes: mild where the tinned and the smoked are strong.
Ploughman's Sandwich
Cheddar in slabs, Branston pickle bleeding through buttered bloomer crumb: the British cheese sandwich by default. The name is a 1956 pub menu line; the form is older.
Pitta Bread
Pitta stuffed with falafel, kebab meat, or salad.
Pilchard Sandwich
Tinned pilchards (larger sardines) on bread.
Piece
Scottish term for sandwich; 'a piece' means a sandwich.
Piece and Ham
A piece and ham is two words said bread-first, and a dialect line down the middle of Scotland: a piece on ham in Glasgow, a piece and ham in the north. A cold slice built to last a shift in the box.
Piece and Cheese
A piece and cheese is the Scots word at its plainest: a slab of Cheddar, butter to the edges, packed cold in the box at the mill. The cheese piece sat at piece-time long before it had a song.
Pie Sandwich
A whole meat-and-potato pie set inside a buttered barm cake, eaten in one hand: the carb-on-carb Lancashire institution that Wigan answers to, and the Galloways pie it races against a clock each year.
Pie Barm
A whole meat and potato pie set inside a buttered barm cake, three layers of pastry and bread in one bite. Wigan eats it on purpose, and calls it the Wigan kebab.
Peanut Butter Sandwich
Half fat and almost no water: the plain peanut butter sandwich is the British cupboard's default round, buttered underneath, split over smooth or crunchy, and lately bigger business than jam.
Peanut Butter and Jam
British version of PB&J; less common than in US.
Pâté and Cornichon (Tea)
Smooth chicken liver pâté with sliced cornichons on brown bread; French-influenced tea sandwich.
Pasty Bap
Cornish pasty in a bap; rarely done, but exists.
Pastie Bap
Northern Irish pastie (minced meat and potato in batter, fried) in a bap; chip shop specialty.
Panini
Italian-style pressed sandwich; very popular in UK cafés.
Panini with Mozzarella and Tomato
Classic Italian-style panini filling.