Cut the scallions in thin slices, separating the white bulb from
the
tender greens. Heat the butter in a skillet, add the white part
of the
scallions and the mushrooms, and toss and cook over medium heat
5 minutes.
Pour in the vermouth and let boil a few seconds, add half the
tarragon,
the crabmeat, and the scallion greens, stirring. When hot, stir
in the
sour cream and/or yogurt, and salt and pepper to taste. Cook just
long
enough to heat through.
Divide evenly over hot buttered toast,
and
scatter the remaining tarragon on top.
Recipe from "The LL Bean Book of NEW New England Cookery"