Preheat oven to 425 °F.
Dissolve yeast in warm water, then add melted margarine, salt, and sugar. Mix in the flour, a little at a time, until a dough is formed. Turn onto lightly floured surface and knead for 6-8 minutes, or until smooth and elastic. Place dough under kitchen towel or plastic wrap to keep moist. Cut off small pieces of dough and roll into 1/4″ logs. (They will puff up more in the oven.)
Place as many as will fit onto a cookie sheet without touching. Brush with melted butter/margarine and sprinkle with kosher salt. Bake for about 10 minutes or until browned slightly dark. Cool on a kitchen towel.
Note: you may have to shake the pan about 1/2 way through, depending on your oven. Also, test your first batch when cooled to make sure they are not soft inside. If they are, just roll future batches a little smaller.
These keep for months in a tightly sealed container.