from the Moosewood Cookbook
Heat 2 tbs. butter in a saucepan. Add garlic, onion, mustard and salt. Saute until tender.
Add water. Cover and simmer over low heat.
In a separate saucepan, melt remaining 3 Tbs. butter. Whisk in 3 Tbs. flour and cook, whisking over low heat, one minute.
Add milk. Cook, whisking, until uniform and thick, 5-8 minutes.
Add horseradish, Sherry and cheese.
Add cheese sauce to onion and mix thoroughly. Add pepper, tamari, Tabasco and Worcestershire. Cook over low heat 8-10 minutes, stirring occasionally.
Salt and pepper to taste, then serve with some fresh grated cheese on top.
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