The secret to a perfect french fry doesn't start with the fryer; it starts with the potato. Choosing the right kind is the single most important decision you'll make. The goal is a fry that's crispy on the outside and light and fluffy on the inside. To get there, you need a potato with high starch and low moisture.

Think of starch granules as tiny balloons. When heated, they absorb surrounding water and inflate, creating that signature fluffy interior. If a potato has too much water, it will steam from the inside out as it fries. This makes it difficult to get a crispy exterior, often resulting in limp, greasy fries.

A high-starch, low-moisture potato, on the other hand, has less water to interfere with the frying process. Its surface dries out quickly in the hot oil, forming a crisp, golden-brown crust while the starchy inside cooks to a perfect, airy texture.

While you can technically make fries from any potato, a few varieties consistently deliver the best results. These are the potatoes prized by chefs and restaurants.

Russet Burbank: This is the quintessential frying potato. Its long, oblong shape is ideal for cutting uniform fries. More importantly, its high starch and low water content are the perfect combination for a fry that's crispy on the outside with a delicate, fluffy interior. It’s the industry standard for a reason.

Kennebec: A favorite of many burger joints and fish-and-chip shops, the Kennebec is another starchy champion. It has a thin skin and holds its shape exceptionally well during frying, producing a fry that is sturdy and crisp.

Yukon Gold: An all-purpose potato that can also make good fries. Yukon Golds have a medium starch content and a naturally buttery flavor. They won't be as fluffy as a Russet, but they'll have a denser, creamier texture and a rich taste.

When you're at the store, picking the best of the bunch is simple if you know what to look for. A great potato will feel heavy for its size.

A firm potato indicates it's fresh and has proper moisture content (not too much, not too little). Soft spots or wrinkles are signs of aging or poor storage. Sprouts, or "eyes," mean the potato is starting to convert its starches to sugars, which can cause the fries to darken too quickly and develop a slightly bitter taste.

Finally, check the skin. It should be smooth and even. While a few minor scuffs are fine, pass on any potatoes with deep cuts, bruises, or dark blemishes.

With the right potato in hand, you've already won half the battle. This solid foundation sets you up for french fry success.