The Shop of Impossible Ice Creams. Book 1 by Shane Hegarty

Limpet’s mum is opening an ice-cream shop, full of her favourite new flavours: mushroom and tuna ice cream, anyone? Roast parsnip and gravy? Limpet’s not sure about this. He likes a nice, safe life. His favourite ice-cream flavour is vanilla. But when wicked Mr Fluffy arrives with his Mega Emporium of Amazing and Spectacular Ice Creams, Limpet knows he’s got to fight back. And there are magic ingredients on his doorstep which can solve all his worries, if only he can get the recipe just right.