How Many Minutes Do Offal Such as Kidney and Spleen Take to Cook?

Kidney and spleen, like other organ meats, cook quickly in a pan over medium heat, in about 8–12 minutes, after proper preparation; prolonged cooking makes this type of offal tough and rubbery. For this reason, cooking time should be kept short and the heat should not be too high.

Why is the smell so strong?
Because the kidney filters waste products in the body, its tissue has a sharp, almost ammonia-like smell; the spleen has a similarly strong smell because it filters blood. This smell is due to the organ’s natural function, not the meat’s freshness, and can be reduced considerably with proper preparation.

How can the smell be removed?
Before cooking, cut the kidney into 2 halves, completely remove the white membrane and layer of fat inside, then soak it in milk or vinegar water for 30–60 minutes; this soak draws out much of the sharp odor. A similar method can be used for spleen, but its outer membrane should also be peeled because much of the smell collects there. In some traditional recipes, offal is briefly parboiled before cooking and the water is discarded; this parboiling takes 2–3 minutes and reduces the smell as well as some of the blood on the surface. Never add the parboiling water to the dish; discard it directly.

Why should the cooking time be so short?
Kidney and spleen have much finer fibers and more delicate texture than other parts of red meat; they cook in a few minutes, and as the time increases they quickly become tough and rubbery. For this reason, thin slices cooked on a grill or in a pan should be cooked over high heat, for a short time, and turned frequently.

What should the internal temperature be?
Unlike whole cuts of red meat, organ meats such as kidney and spleen should be cooked to an internal temperature of at least 71°C / 160°F; a thermometer is the most reliable way to check. The color of the cut surface or clear juices alone do not show that it is safely cooked.

Is pan-frying or grilling more suitable?
Kidney and spleen give the best result when thinly sliced and quickly sautéed with onions; a sauté cooked for a long time over low heat makes this type of offal tough. For grilling, slices should be no thicker than 1 cm and should not be cooked for more than 2–3 minutes per side.

What ingredients are used alongside them?
Cumin, sumac, and plenty of onions are classic accompaniments that balance the strong smell of kidney and spleen. If these spices are added during the final minutes of cooking rather than earlier, their aroma remains more pronounced. An acidic touch such as lemon juice or vinegar also softens the smell and the texture somewhat.

Should they be soaked in plain water first?
Soaking kidney or spleen in plain cold water for about 20 minutes before placing it in milk or vinegar water washes away much of the surface blood and makes the milk soak more effective; changing the water 1 time makes this step more effective. If this initial rinse is skipped, the milk soak has to do more work and odor removal is less complete.