HP sauce /ˌeɪtʃ piː ˈsɔːs/ BrE AmE trademark
a type of thick, dark brown liquid made of vegetables, fruit, and ↑ spice s , which is sold in a tall, thin bottle, and poured over food, especially fried (↑ fry ) food like eggs and ↑ sausage s . It is popular in the UK.