1/2 unwaxed lemon, zested (if removing in strips instead of using a zested, make sure you remove any white pith)
To serve
crème fraîche
Peter's Yard original crispbreads
Method
1
To begin, place all of the ingredients (apart from the mackerel fillets) in a saucepan and bring to the boil. Remove from the heat and allow to cool completely
2
Arrange the mackerel fillets in a shallow dish and pour the cooled liquid over the top. Refrigerate for 24 hours
3
Serve the fillets sliced with crème fraîche and crispbreads