In the name of research, of course, I've been scoffing mince pies since 30th of August. Hey, it's not my fault the grocery stores decide to stock up so early!
So far, Sainsbury's Taste the Difference range is leading for both flavour and casing. Particularly their frangipane variant. Especially warmed up - the frangipane goes even softer and slightly gooey when heated.
Their more basic own-brand are terrible, though. Dry pastry and not enough filling.
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