Method
Melt butter, add flour, mix well, slowly blend in
milk and stock.
Bring to boil, simmer 1 minute, add grated cheese and
mustard.
Heat through until cheese melts, add yabby meat, warm
through.
Do not boil as this will toughen meat
If the sauce is too thick, add a touch more milk
Serve in Yabby shells or ovenproof dish.
Sprinkle with grated cheese on top, grill until golden.