Roasted Bull’s Testicles: A Recipe for White Kidneys

This post is also available in:

Roasted Bull Testicles (also known as white kidneys or “Rocky Mountain oysters”) —a professional culinary guide to this crispy and creamy delicacy, which surprises with a flavor reminiscent of the tenderest veal—are considered one of the most iconic dishes for true culinary adventurers. Although many raise an eyebrow at the mere mention of them, they are prized as a top-tier specialty in global gastronomy (from the American Wild West to traditional Balkan and Spanish cuisines). The secret to their popularity lies in the incredible contrast of textures: a properly prepared batter made from white and corn flour creates a thick, golden-brown, crispy exterior, while the center remains heavenly tender, creamy, and reminiscent in flavor of the finest vealsweetbreads. The biggest challenge when preparing them at home is proper cleaning (removing the tough outer membrane) and neutralizing the distinctive odor. In this expert recipe, we reveal key butchery and cooking tricks: from partially freezing it to make peeling easier, to the essential milk bath and the traditional Southern “dredge” breading without eggs, which brings out the natural flavor of this unique ingredient.

• Prep time (cleaning): 20 minutes
• Marinating time: 1 to 2 hours
• Frying time: 6 to 8 minutes per batch
• Serves: 4 to 6 people
• Difficulty: Medium (requires precision when peeling the skin)

Ingredients for Crispy Buckwheat “Bull’s Eggs”

For meat and a tenderizing marinade

• 12 small bull testicles (or a smaller number of larger ones; total weight approximately 1 kg)
• 2 cups (500 ml) whole milk (for extracting flavors and softening)

For a crispy Southern-style breading

• 1 cup (about 120 g) of fine or medium-ground cornmeal (creates a perfect crunch)
• 1 cup (about 120 g) of fine white wheat flour (type 500)
• 1 heaping teaspoon of ground sweet paprika (for a beautiful golden color)
• 1 to 1.5 teaspoons of fine sea salt
• 1 teaspoon of freshly ground black pepper
• Optional: a pinch of garlic powder or cayenne pepper for a spicy kick
• about 1 liter of neutral frying oil (sunflower or canola)

Step-by-Step Preparation Process

1. Removing the Tough Membrane (A Crucial Butchery Step): Thoroughly wash the bull testicles under cold water. It is very important to completely remove the outer, tough membrane, which is inedible. Using an extremely sharp knife, make a long cut through the outer membrane, then carefully pull the membrane away from the soft meat with your fingers (similar to peeling a banana). The flesh inside is extremely tender, so be gentle so as not to crush it.

2Cutting into medallions: Rinse the peeled, clean meat and use a knife to cut it into even slices (medallions) about 1 centimeter thick. Due to its tender texture, the slices may lose their perfectly round shape slightly, which is completely normal.

3Marinating in Milk (Extraction and Tenderizing): Place the meat slices in a deep bowl and pour 2 cups of cold milk over them. The meat must be completely submerged. Cover the bowl and place it in the refrigerator for at least 1 hour (preferably 2 to 3 hours). The milk will draw out any remaining blood from the meat and neutralize any strong or unpleasant glandular odors, while also making the meat extremely tender.

4. Preparing the dry breading: In a large, shallow bowl, thoroughly mix together the all-purpose flour, cornmeal, salt, black pepper, and ground paprika. In this recipe, the cornmeal is the secret to creating a coarse, exceptionally crispy texture that serves as the perfect contrast to the meat’s creamy center.

5Breading (the “dredging” technique): After marinating, remove the bull testicles from the milk and drain them in a colander (do not rinse the milk off with water!). While the slices are still damp, dip them one by one into the mixture of flour and spices. Use your hands to press the flour firmly against the meat on all sides to create a thick, even coating. Place the breaded pieces on a dry plate or tray.

6Proper Deep-Frying: In a deep, wide skillet or cast-iron pot, heat the oil to approximately 170 to 175 °C. Carefully place the breaded slices into the hot oil (fry in batches so as not to overcrowd the pan and lower the oil temperature). Fry for about 3 to 4 minutes on one side, then carefully flip them with tongs and fry for another 3 minutes, until they are a beautiful golden brown and crispy.

7Draining and Serving: Remove the fried medallions with a slotted spoon from the oil. To keep them as crispy as possible, place them on a wire rack (with paper towels underneath)—if you place them directly on the paper, the bottom will become soft due to trapped steam. Serve hot, preferably with a fresh salad, cold potato salad, or a spicy dip.

Professional Culinary Tips for Bull’s Eggs

• A butcher’s trick involving freezing: Raw bull testicles are extremely soft and slippery, which makes it very difficult to remove the sinewy outer membrane and cut them evenly. Professional tip: Place the meat in the freezer for 30 to 45 minutes before you start trimming and slicing it. Once the meat is partially frozen (just slightly firm), the membrane will peel away easily, and the slices will be perfectly straight and symmetrical.
• The Science of Milk Baths: Why Always Milk? Bull testicles are glandular tissue. Milk contains casein, phosphates, and calcium, which effectively bind specific minerals, blood, and dirt, and neutralize the glandular odor that could be too strong when frying. At the same time, milk acts as a natural “binder” for the dry flour in the breading.
• The Southern-Style Breading Technique (No Eggs!): Have you noticed that this recipe doesn’t include the step with beaten eggs and breadcrumbs (classic Viennese breading)? The texture of bull testicles is so delicate that a classic thick breadcrumb crust would completely overwhelm it. The combination of milk on the meat and a dry corn-wheat mixture creates the famous “Southern fry”—the crust is light, coarse, exceptionally crispy, and absorbs less fat.
• Be careful with the frying time: The meat of bull’s testicles cooks very quickly. If you fry them for too long (more than 8 minutes total), the proteins in the center will contract too much, and the meat will become tough and rubbery. The goal is a crispy crust and a creamy (pudding-like) interior.

Frequently Asked Questions (FAQ)

What do bull testicles actually taste like?

Despite common misconceptions, the flavor is exceptionally mild and refined. It is best described as a blend of the most tender veal (veal cutlets) and veal sweetbreads (sweet glands). The texture is very smooth, creamy, and meaty, without the distinct flavor of classic offal (such as liver or kidneys).

What should I serve with scrambled bull’s testicles?

Since this is a fairly filling, fried dish with a “rich” flavor, it needs a tangy contrast. In the U.S., it’s traditionally served with spicy BBQ sauce, garlic mayonnaise (aioli), or hot cocktail sauce. As for side dishes, a light, tangy potato salad with chives or a generous serving of a refreshing mixed green salad pairs best.

Can I also prepare pork or lamb testicles using the same method?

Yes, the process of cleaning, marinating in milk, and breading is exactly the same for all types (so-called “white kidneys”). The only difference is in size—pork and lamb kidneys are considerably smaller, so adjust the frying time accordingly (reduce the time to about 2 to 3 minutes per side, depending on the thickness of the slice).