easy left over roast lamb shepherds pie hack

left over roast lamb
1 small onion diced
gravy PDR + boiling water 1 cup made up
1 TBLSP of bbq sauce
mash:
instant mash 1cup
1 TBLSP of butter
salt and pepper to taste
1 egg ( helps the structure of the potato)
1 cup of boiling water add gradually to achieve consistency add more boiling water if required.
topping:
parsley and cheese to serve
cook 180 degrees for about 2 minutes to hear and brown
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