Accompaniment: Butternut Squash, Turnip, and Green-Bean Quinoa (see recipe) Season filets with salt and pepper.
In a 2 litre saucepan heat demiglace and water just to a simmer and add steak. Add some boiling water to mixture if necessary to make enough liquid to just c over steak. Poach steak at a bare simmer (meat will toughen if liquid is allow ed to boil), without turning, 8 minutes and remove from broth. Boil broth over high heat until reduced to about half cup and stir in mustard and horseradish. Keep sauce warm over low heat and halve steaks horizontally.
Mound quinoa mixture on 1 side of 4 large plates and arrange 2 slices steak alo ngside. Spoon sauce over steak.
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