Where can I find Mustard in Werthenstein?

Mustard can also be found in these cities:

Buchrain Ebikon Egolzwil Emmen Hitzkirch Horw Huttwil Kriens Lucerne Malters Oberkirch Rain Ruswil Sarnen Sempach Stans Sursee Urswil Wolhusen Zell

You can also find this in Werthenstein:

Gin Cookies Buttered Toast Sausages Edible Curd Grated Lemon Peel Flaxseed Bread Fruit Bar Pickled Vegetables Fresh