No More Foil: Sanctifying My Air Fryer Food to Crispy Goodness

Grey Ninja Max air fryer on a wood counter, its basket lined with a round parchment liner holding crispy wings and a lemon wedge, beside a stack of paper liners, half a lemon, a dish of salt and a sprig of rosemary. — The occasional way: wings and lemon right on the liner. Usually it sits under the metal rack. No foil either way.

I bought my Ninja Air Fryer Max XL in August 2022. On October 11 of this year I reordered a box of 1,000 paper liners for it. Those two purchases say most of what you need to know about how I eat. I like crispy everything: wings, potatoes, fish, leftover pizza. A lot of my meals go through that basket.

For a long time the basket got a sheet of aluminum foil first. It cut down on scrubbing and I never thought about it. Then I learned that hot foil and a squeeze of lemon aren't a great pairing, so I switched to round parchment liners. They're cleaner, I feel better about them, and at $35.99 for 1,000 they come to about 4 cents each.

Why foil and lemon don't mix

Foil isn't poison, and it's fine for wrapping leftovers. The issue is what happens when it's hot and touching something acidic or salty. Acid and salt help pull aluminum out of the foil and into the food. A lemon wedge on wings, a vinegar marinade, tomato on fish: those are exactly the conditions that raise it. [1,3]

Germany's Federal Institute for Risk Assessment (BfR) advises against putting acidic or salty foods in direct contact with foil, and suggests a paper layer between the food and the foil if you use it at all. [5] That was enough for me. I don't need a dramatic reason to change a habit that costs 4 cents to fix.

What the research measured

Bassioni et al., 2012. In one study, strips of foil were boiled for two hours in a meat broth with tomato juice, citric acid and salt. That's a harsh lab test, not a recipe. Acidic solutions pulled out much more aluminum, and adding spices made it worse: the estimated intake per serving went from about 132 mg to 537 mg. The authors' conclusion was blunt. Foil is fine for packing, not for cooking, especially with acidic food. [1]
Ranau et al., 2001. In another study, fish cooked in foil ended up with 2 to 68 times more aluminum, with the biggest jump in spiced mackerel. The researchers still judged the risk low. [2]
Czech Journal of Food Sciences, 2019. In a study of baked fish, more acid and more heat meant more leaching. Levels stayed under safety limits, but the authors noted that kids, older people and people with kidney disease are more vulnerable. [3]

For scale, the European Food Safety Authority puts the tolerable weekly intake at 1 mg of aluminum per kilogram of body weight, and many Europeans already reach that from normal food. [4] So my wings aren't a crisis. Foil is just one source of aluminum I can drop without giving anything up.

How I use the liners in my Ninja

My air fryer is the Ninja Air Fryer Max XL, model AF161, the 5.5-quart one. It lists at $164.66 right now, and mine has been in steady use for over three years. To be fair to Ninja, its own FAQ for the Max XL line says both parchment and foil are fine in the basket. [8] Nobody told me to stop using foil. It was my call.

Most of the time the liner doesn't touch my food at all. It goes flat in the bottom of the basket, under the metal rack. It catches the drips and grease, air still moves under the food so things crisp all the way around instead of sitting in their own juice, and the only thing that gets dirty is the rack itself. That makes cleanup easy. Sometimes I put the liner directly under the food instead. My routine is simple:

Preheat first. The liner goes in after the preheat, never before.
Liner flat, rack on top. The rack holds it down and keeps it away from the heating element.
Food on the rack. Drips and lemon juice land on the paper, not the basket.
Toss it. The rack gets a quick wash, and the basket stays clean.

On the nights the liner goes right under the food, I keep the food spread across it so it stays put. Either way, the wings still come out crispy, which was the only thing I really cared about.

A couple of cautions

Paper in a small, hot fan oven deserves a little respect. Reynolds, which makes its own liners, says never to run a liner by itself, because the moving air can lift it into the heating element, which is a fire hazard. Put it in after preheating, and never run it empty: something has to hold it down, either the rack or the food. [6,7] Keep it flat, too. A liner that's too big or crumpled up the sides can block airflow, and blocked airflow is how you get soggy food. [6]

Reynolds rates its liners to 400°F. Check the box on whatever liners you buy, because the Max Crisp setting on my Ninja runs hotter than that. If you use Max Crisp, skip the liner unless its box says it can take the heat. [6]

Why I keep reordering

It's a boring product, and that's the point. Nothing about my cooking changed except the cleanup got easier and the foil went away. At about 4 cents a liner, it's the cheapest upgrade in my kitchen, and it lets me squeeze lemon on whatever I want without thinking about it.

If you line your air fryer with foil and like a little acid on your food, this is an easy switch. You cut out some aluminum you don't need, the food stays crispy, and the basket barely needs washing.

Why foil and lemon don't mix

What the research measured

How I use the liners in my Ninja

A couple of cautions

Why I keep reordering

Sources