Make sure oatcakes are hot.
Melt butter in a pan, add 2 egg yolks, 1 egg white, fish paste, pepper.
Stir until thick.
Pile mixture on top of oatcakes.
NOTES : This little savoury sounds rather odd when scanning the ingredients, but it's really very tasty. If nothing else it will give you the opportunity to sample an interesting and delicious fish paste, quite unlike the commercial varieties.