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Open one can of mackerel , drain the water and put it in to a bowl. 

 

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Slice an onion finely, about 1/2 tsp pepper, Slice some chillies, ( this step is optional), enough salt and lime or lemon. Prepare  them.

 

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Melt butter in a mixing bowl. This is about 50g. More the butter more tastier it is.

 

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Crush the fish using a fork.

 

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Add the melted butter in it and mix well.

 

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Now squeeze the lemon in to it.

 

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Add onion and chillies, salt and pepper. Mix well..

 

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Lay two slices of bread on a chopping board.

 

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Spread the prepared mix.

 

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Close the bread and press.

 

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Toast it in a grill or in a sandwich press.

 

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Enjoy. Simple meal.