Shepherd's or cottage?

N made a pie, topped with potato, with onions, Quorn mince, tomatoes, brown sauce (her ‘magic’ ingredient).  Now is this a cottage pie, or a shepherd’s pie?  My M&D said that a shepherd’s pie was with lamb (get it?) and a cottage with beef (or pork?).  A dilemma. Maybe a new name – ‘gardener’s pie’