The problem with most air fryers is that once you come to love what they do and become used to them, you then have to work out how to cook different items at the same time. Last year’s Ninja Dual Zone Air Fryer AF300UK solved that issue by including two individually controlled drawers. This year, we have the larger model the Ninja Foodi MAX Dual Zone Air Fryer AF400UK, presenting even more cooking room. The Ninja favours a dial over a touchscreen system (like the Instant Vortex Dual Zone has), which makes operating it really simple. You're not restricted by the preset temperatures or timings either, as you can use the two sets of arrows to set your own cooking course. The easy-to-use digital control panel with a countdown timer makes it easy to see how much cooking time is left. On the day of testing itself, it was plainly obvious that the Ninja Foodi MAX Dual Zone was by far the superior appliance. It was the nicest to program, while some of the Tower models had oppressive beeps and stiff drawers and it had by far the best cooking ability. It was the fastest and achieved an incredible crisp on nuggets and fish fingers, with the quality of the machine itself also being standout. Ninja provides a handy cookbook in the box, which provides rough cooking times for raw and frozen ingredients, plus a few recipes with which to get started. As a rough guide, I usually reduce oven cooking times listed on items by around 20%.

In my opinion it’s way too big for single person households unless you host a lot. And if you have a teeny kitchen, you’ll need to be prepared to find space for it, since it’s quite wide and tall. Furthermore, it’s one of the most expensive Ninja air fryers - a fact that can’t be ignored in your decision about whether to buy.testing and calculations based on recommended cook time for sausages, using air fry function versus conventional ovens Cooking for extra guests or feeding the whole family? Use the MATCH feature to double your serving size, with the same cooking program and time across both drawers. I forgot to say that you can set each drawer at a separate temperature and time or sync them to finish at the same time! As with the older model, the AF400UK excels for cooking options. Each drawer can be controlled individually, with a choice of Max Crisp (240ºC heat for crisping up chips, for example), Air Fry, Roast, Bake, Dehydrate (perfect for saving herbs) and Reheat. You can control the temperature for each mode and select a cooking time.

If you’re looking for an air fryer that can do it all, I truly think you’re not going to get any better than the Ninja Foodi MAX Dual Zone Air Fryer AF451UK. This appliance is easily one of the best in its class. Not only do you have a choice of six different cooking methods – from air fry and roast to bake and even dehydrate – but there’s a super smart dual cook feature that can ensure two different foods are correctly cooked, simultaneously, and are ready to eat at the same time. The addition of the Digital Cooking Probe is also a game changer for those who regularly cook meat dishes, especially big roast joints of beef or lamb, as it cooks the meat to your desired level without needing your constant attention. There are several great reasons to buy this air fryer. Namely, its huge capacity makes it the perfect choice for families or people who like to entertain a lot. And then there’s the undeniably useful flexibility of being able to switch between one larger cooking zone and two smaller ones. At this point it goes without saying that it’s simple to use and cooks superbly. Cooking for two different dietary requirements? Cater for everyone by cooking vegetarian food in one drawer and meat in the other. If you want to use the two drawers together, you have a choice of two modes: Match and Sync. Match applies the same settings to both drawers, letting you double-up portions. Sync allows individual settings, but the AF400UK ensures that both drawers complete cooking at the same time.To accompany the chips, I cooked some sausages. Using spray oil to give them a light coating fat, I placed them in the AF400UK at 180ºC with the timer reduced by 20% compared to the cooking instructions. After the time had elapsed, the sausages were perfectly cooked: crisp and browned evenly all over.