Leipäjuusto (Bread Cheese)

The dark spotting that appears on leipäjuusto during baking is caramelized milk protein, not burnt cheese — it should smell fragrant and nutty, not acrid. The Maillard reaction and sugar caramelization occur on the surface under dry oven heat, creating a crust that is firm enough to hold its shape but thin enough not to resist a fork. The squeak, which gives the cheese its nickname 'squeaky cheese,' is produced when the denatured protein fibers in the warm cheese catch against tooth enamel. It is most pronounced in the first few minutes out of the oven and diminishes rapidly as the cheese cools. This is why timing at the table matters more than any other factor in working with leipäjuusto.

When purchasing unbaked loaves, look for a smooth, uncracked surface and a fresh bake-by date. The cheese should feel firm and heavy for its size, indicating good moisture content. Vacuum-sealed loaves are preferable to loose-cut pieces, which may have begun to dry at the edges. In Scandinavian specialty stores, you will often find it sold whole or pre-sliced; whole loaves give you more control over baking and presentation. If you see it labeled 'Finnish grill cheese,' that is the same product — the name reflects its use on Scandinavian grills and BBQs.