This is modern take on a traditional recipe from East Anglia in England. A more traditional version calls for fatty bacon, and apple cider (the alcoholic kind.) Ideal for making up a day ahead, then using on a picnic or for a brunch the next day to eat cold / room temperature. Huntingdon is in Cambridgeshire, near Cambridge.
Use a round pie pan or casserole dish, about 8 or 9 inches wide and about 1 1/5 inches deep (20 or 23 cm wide x 4 cm deep). See entry on Baking Pans for more size substitutions and conversions. 1 pound (450g) of apples is 4 small, 3 medium or 2 large apples. Instead of ham you can use Back Bacon.