1
In a medium saucepan, bring water, butter, and salt to a boil over high heat. Add flour, stirring vigorously with a wooden spoon until a smooth dough forms.
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2
Remove from heat. Stir in mustard and Parmesan cheese until well combined. Add eggs one at a time, fully incorporating each before adding the next.
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3
Transfer the dough to a pastry bag with a 1/2-inch tip. Bring a large pot of salted water to a simmer. Pipe the dough into the simmering water, cutting into 1-inch pieces.
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