1) Put steaks between
2 sheets of greaseproof paper and beat with a rolling pin to flatten them
a little. (I skipped than step an it didn't seem to matter).
2) Heat butter in large
frying pan and, when the foam subsides, brown the steaks well on both sides.
Remove and keep warm. (the steaks, that is)
3) Add the wine to the
pan and stir and scrape all the brown off the bottom.
4) Blend in the mustard,
salt and pepper and simmer, uncovered, for 10 min.
5) Add the mushrooms
and simmer for a minute.
6) Whisk the cream and
egg yolk together and stir in. Heat very gently, stirring, until the sauce
thickens a little and becomes glossy, but do not let it boil.
7) Pour sauce over veal
and serve very hot.

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