INGREDIENTS
1 lb
baby bella mushrooms
1/2
a softball sized yellow onion, peeled and roughly chopped
3 cloves
garlic, peeled and roughly chopped
the leaves from 2 sprigs fresh thyme
2 tbsp
grapeseed oil
salt and pepper
3 lb
chateaubriand (center cut) beef tenderloin
salt and pepper
4 oz
thinly sliced prosciutto
6
sprigs fresh thyme
2 tbsp
Dijon mustard
flour, for rolling out puff pastry
12 oz
puff pastry (use frozen and thaw it, or make your own puff pastry)
1
large egg, lightly beaten (for egg wash)
reserved drippings and pan from searing beef above
2 tbsp
butter
1/3
of a small onion, sliced or chopped
3 cloves
garlic, peeled and smashed
2
sprigs fresh thyme
2 tbsp
brandy
26 oz
box beef stock (3.25 cups)
2 tbsp
heavy cream
2 tbsp
grainy Dijon mustard
25
black peppercorns