Tuna Chunks in Sunflower Oil. Princes Tuna Chunks in Sunflower Oil are naturally high in protein, free from artificial preservatives, colours and flavours, and are responsibly sourced and dolphin-safe. Put greatness on the table with this 100% recyclable 4 pack of 145g tins. With sunflower oil that adds serious oomph to salads, pastas, sandwiches and more, you're set to tick all the flavour boxes whether cooking for yourself or the whole family.