Simplicity itself ...
Smoked mackerel is available very cheaply at just about every supermarket you might care to mention and quickly turned into a delicious starter.
Take a smoked fillet per person. Into a bowl, remove the flesh from the skin and take care to pick out any straggling bones.
Squeeze some lemon juice over the fish for some zing and add a half teaspoon per fillet of horseradish or mustard, perhaps chilli powder; something to give it some bite as well.
Stir in a good tablespoon per fillet of Greek yoghurt, natural probiotic yoghurt or some mayonnaise. You could even just stir in some extra virgin olive oil.
Sea salt and freshly milled black pepper are mandatory.
Stir, stir and stir some more until the flesh is broken up and all the ingredients well combined.
Serve out onto a plate with a few things to accompany - salad ingredients and an egg, naturally.