Gather the ingredients.

In a large bowl, combine the flour, salt, and sugar.

Add the yeast, butter, and enough warm water to make a soft, sticky dough. Add a little more flour or a little more water if necessary to achieve that consistency.

Knead the dough by hand or with an electric stand mixer and dough hook for 5 to 10 minutes until smooth and elastic; the dough should remain tacky so you may find that a stand mixer is easiest.

Transfer the dough to an oiled bowl, gather it up into a mound, and turn it over. Cover the bowl with plastic and then a towel and set aside in a draft-free place to rise until doubled, about 30 minutes in a very warm kitchen or an hour or longer in a cool kitchen.

Divide the dough into 10 to 12 plum-sized balls. Set the balls of dough on a lightly floured surface, cover, and leave to rest for 15 to 20 minutes.

Line one or two baking sheets with parchment paper. Take a ball of dough and gently spread and shape it into a flat, oblong roll about 6 inches in length. Transfer it to the prepared pan and repeat with the remaining dough, allowing space between each roll for expansion. Cover and leave the rolls to rise for 30 to 60 minutes. Preheat oven about 20 minutes before baking to 400 F.

Place the panini rolls in the middle of the oven and bake for about 8 minutes, or until set and barely colored. Remove from the oven and allow to cool before slicing lengthwise along one side and building sandwiches.