Muggety Pie is a meat pie, traditionally made in Cornwall, England. The meat inside the pie is offal, usually stewed intestines.
The word "Muggots" in Cornwall meant intestines from a pig, and sometimes a calf. 
Here is an 1839 definition: "Muggety-Pie: a pie made of calf's entrails. Cornwall." 
Here is an 1882 definition: "Muggety-pie. A pie of sheep's, sometimes calf's entrails, flavoured with parsley, pepper, and salt, and enriched with cream." 
Other writers have since noted that instead of using intestines from a sheep or calf, you could instead use those from a pig. Variations also suggest you can use lungs, liver and heart.
Cornish Recipes - Ancient and Modern gives 3 different recipes for it. One of the recipes calls for a few currants to be added to the meat mixture:
"Prepare a sheep's pluck by soaking in water and thoroughly cleaning. Boil for several hours, and when cooked, put through mincing machine; then add a few currants, season well, and flavour with parsley or spice. Mix well together, put into a pie dish, cover with good short crust, and bake three-quarters hour." 
 Grose, Francis and Samuel Pegge. A glossary of provincial and local words used in England. London: John Russell Smith. 1839.
 Martin, Edith. Cornish Recipes - Ancient and Modern. Truro: Cornwall Federation of Women's Institutes, 1962 (originally published 1937.)
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