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In the headnotes to the recipe, the tester says that she used 1.5 tsp as a compromise and liked the results. You might try that!
Very sorry about all the confusion. I've been having a devil of a time trying to edit the recipe -- it just never seems to change!
The correct amount is 1 tablespoon. I just leave them whole, but you could crush them a bit in a mortar and pestle if you want more mustard flavor. I would not use ground, however, as I think that would be too strong and would probably also leave a film on the celery.