I marinated my cheap steak in mashed kiwi fruit to tenderize it. 2 hours later, this is what happened

When it comes to cooking steak, many of us face the challenge of making a cheaper cut as tender and delicious as its more expensive counterparts. While traditional methods like marinating in wine or vinegar are well-known, I stumbled upon an unconventional technique that piqued my curiosity: using mashed kiwi fruit as a tenderizer. Intrigued by the idea, I decided to put it to the test and see if this tropical fruit could transform a budget-friendly steak into a culinary delight.

Kiwi fruit contains natural enzymes that are reputed to break down proteins, potentially making it an ideal candidate for tenderizing tough cuts of meat. With a couple of kiwis and a modestly priced steak from the local market, I embarked on a culinary experiment that promised either a disaster or a surprising success. Here's what happened when I marinated my steak in mashed kiwi for two hours.

The idea of using kiwi as a tenderizer was both intriguing and economical. Given the rising costs of quality cuts of beef, I was searching for ways to make cheaper options more palatable without breaking the bank. Kiwi fruit, with its vibrant color and tropical taste, seemed like an unusual yet promising choice. Each kiwi cost me about $0.50, which was a small price to pay if it meant improving the texture of a $5 steak.

Additionally, I was drawn to the simplicity of the method. Unlike store-bought tenderizers that often contain chemicals and preservatives, kiwi offers a natural alternative. With just a fork and a plastic bag, I could create a marinade that was not only effective but also free from artificial additives.

Kiwi fruit contains an enzyme called actinidin, which is known for its ability to break down protein structures. This enzyme works by cleaving the peptide bonds in proteins, effectively tenderizing the meat by making it less tough and chewy. Compared to other fruits like papaya and pineapple, which contain similar enzymes (papain and bromelain respectively), actinidin is gentle yet effective, making kiwi a suitable choice for those who want to avoid over-tenderizing.

In my research, I found that actinidin is most active at a pH level around 3.0, which is similar to that of the kiwi fruit. This means that when kiwi is mashed and applied to meat, the enzyme remains active and works efficiently to tenderize even the toughest cuts. However, timing is crucial, as too long a marinade can lead to mushy rather than tender meat.

For this experiment, I chose a top sirloin cut, known for its affordability and flavor but often criticized for its toughness. At approximately 1 inch thick and weighing around 8 ounces, it was the perfect candidate for a tenderizing test. I selected two ripe kiwis, ensuring they were soft to the touch but not overly mushy, to maximize their enzyme content.

In terms of timing, I wanted the marinade to be long enough to see a noticeable difference but not so long that it compromised the meat's texture. Based on my research, I decided on a two-hour marinade, which seemed to strike the right balance between effectiveness and overexposure to the enzyme.

I began by peeling the kiwis and mashing them into a pulp using a fork. The result was a vibrant green mush that smelled tangy and slightly sweet. I placed the steak in a resealable plastic bag and poured the mashed kiwi over it, ensuring the meat was thoroughly coated. A gentle massage helped the fruit penetrate the surface of the steak.

After sealing the bag, I placed it in the refrigerator to marinate. The bagging method ensured even coverage of the fruit and minimized any mess. I set a timer for two hours and eagerly awaited the results of this unconventional tenderizing technique.

As the steak marinated, I periodically checked the bag to observe any visible changes. After about an hour, I noticed that the kiwi pulp had started to break down further, turning into a thinner liquid. This was a promising sign that the enzymes were actively working on the meat.

By the end of the two-hour wait, the steak appeared slightly darker in color, likely due to the acidic nature of the kiwi. It was time to remove the meat from the marinade and prepare it for cooking.

Upon removing the steak from the bag, I noticed that the surface had a slightly mushy texture, a clear indication that the enzymes had begun to break down the proteins. The color was a deeper shade of red, and the kiwi pulp had almost completely liquefied.

In terms of smell, there was a faint tropical aroma from the kiwi, but it was not overpowering. I carefully patted the steak dry with paper towels to remove excess moisture, which would help achieve a good sear during cooking.

To sear the steak, I heated a cast-iron skillet until it was smoking hot, adding a small amount of oil to prevent sticking. The key was to achieve a quick, high-heat sear to lock in juices and develop a flavorful crust.

I placed the steak in the pan and allowed it to cook for about 3 minutes on each side, carefully monitoring to avoid overcooking. The sizzling sound was music to my ears, and the aroma of the steak was mouthwatering. Once seared, I let the steak rest for a few minutes before slicing.

Slicing into the steak revealed a perfectly pink interior. The texture was noticeably more tender than I anticipated, with a slight give that was absent in previous attempts with this cut. The kiwi had worked its magic, transforming the once tough meat into a succulent delight.

Flavor-wise, the steak retained its beefy essence, with only a subtle hint of the kiwi's sweetness. It was juicy and satisfying, a testament to the effectiveness of this unconventional tenderizing method.

While the steak was delicious, I did notice a few downsides. The edges of the steak, which had more contact with the kiwi pulp, were slightly mushy. This was a clear indication of over-tenderizing, where the enzymes had broken down too much of the protein structure.

This experience highlighted the importance of timing and even distribution of the marinade. Leaving the steak in the kiwi pulp for longer than two hours could have resulted in an undesirable gelatinous texture.

Compared to store-bought tenderizers, the kiwi method provided a more natural and flavorful alternative. Many commercial products rely on chemical additives, which can alter the taste of the meat. The kiwi marinade preserved the steak's original flavor while enhancing its tenderness.

When compared to classic marinades like wine or vinegar, kiwi was faster acting and required less planning. However, it lacked the depth of flavor that these traditional marinades can impart. For those seeking a quick and easy tenderizing solution, kiwi fruit stands out as a viable option.

Given the results, I would certainly consider using kiwi as a tenderizer in the future, especially for tougher cuts of meat. However, I would adjust the marinating time to perhaps 90 minutes to avoid any risk of over-tenderizing.

If you're interested in trying this method, ensure the kiwis are ripe and avoid marinating for more than two hours. Always pat the steak dry before cooking to achieve a proper sear. With these tips in mind, you can experiment with kiwi as a natural and effective way to tenderize your favorite cuts of steak.