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Heat oil and butter in large saute pan over medium
heat. Add sliced
onions, salt, and pepper. Cook 10 minutes or until
caramelized
(softened and golden brown), stirring frequently.
Add wine, broth,
vinegar and chopped rosemary. Bring to a boil.
Reduce heat and simmer
for 10-15 minutes or until sauce is reduced by
half.
Rub beef filets with oil, then season with salt
and pepper. Grill to
preferred temperature. Place grilled filets on
a large platter; top
with sauce. Garnish with parsley and rosemary.