Which is the main ingredient of a stargazy pie?

Stargazy pie (sometimes called starrey gazey pie, stargazey pie and other variants) is a Cornish dish made of baked pilchards (or sardines), along with eggs and potatoes, covered with a pastry crust. Although there are a few variations with different fish being used, the unique feature of stargazy pie is fish heads (and sometimes tails) protruding through the crust, so that they appear to be gazing skyward.

The dish is traditionally held to have originated from the village of Mousehole in Cornwall (South West England) and is traditionally eaten during the festival of Tom Bawcock's Eve to celebrate his heroic catch during a very stormy winter. According to the modern festival, which is combined with the Mousehole village illuminations, the entire catch was baked into a huge stargazy pie, encompassing seven types of fish and saving the village from starvation. The story of Bawcock was popularised by Antonia Barber's children's book 'The Mousehole Cat', which featured the stargazy pie. In 2007 contestant Mark Hix won the BBC's Great British Menu with a variant of the dish.