Haggis Lasange

Can't remember where i got this one but i've yet to cook it for someone that didn't like it !

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   1.pre-heat oven to 180 degrees
   2.melt butter in a saucepan add flour and mustard powder to make a paste.
   3.Add milk little by little keeping the mix on a high heat and stirring continuously (I like to use a whisk at this stage to ensure no lumps)until you have a thick white sauce. 4.Add salt pepper and mixed herbs depending on taste.
   5.Place lasagne sheets into boiling water for a few moments to slightly soften.
   6.break haggis up in a bowl - if using tinned haggis sometimes helps to heat it a little.
   7. Layer Lasagne, haggis and white sauce in a lasagne dish and top with grated cheese and sliced tomato, sprinkle with dried mixed herbs
   8. oven bake for approx 1 hour or until pasta is tender and golden on top .