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I am trying to roast potatoes to a crisp skin texture while making a roast in the same oven.

When I am making a meat roast, I want to make a potato side dish with it. However, when I put the potatoes in the same tray as the meat, the meat juices cover the potatoes and they will not form a crispy skin when surrounded by liquid.

I have tried (on my old oven) to utilize another roasting tray, exclusively for the potatoes, and located that tray underneath the 'meat tray' but in that case, barely any heat was conducted to the lower part of the meat.

On my current oven, I've got two settings, Bake and Broil, my heat convection capabilities are limited - I think.

How do you cook your meat perfectly and serve with crisp-skinned roast potatoes that have been cooked in the same oven? How do you usually achieve this?

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Sharing the oven should work; it sounds like your oven may be terribly underpowered. Is this a full sized oven or a countertop model? –  SAJ14SAJ Jan 10 at 6:27
    
Maybe it should. I will try it next time. I just remember the lower part of the meat being undercooked when I placed the potato roasting tray underneath the meat roasting tray. This was on my old oven, maybe I should give it another shot on the new one. It is full size yes. –  l3win Jan 10 at 6:31
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4 Answers 4

Here's what I'd suggest:

  1. Reverse your food positions. Roast the meat toward the bottom of the oven and the potatoes toward the top.
  2. Place the potatoes on a jelly-roll sheet, not in a roasting pan.
  3. Stagger the pan positions. The less that they are exactly on top of one another the better. Yet, at the same time, no pan can be so close to any oven wall that it cuts off circulation. So, choose pans sizes that will allow for this. During baking, rotate each pan 180 degrees.
  4. It takes more energy to heat more items. When you put more items into the oven than called for by the recipe, you must increase either the heat, or the time, or both.
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This is one of the reasons fan ovens were invented - the oven elements in standard ovens are in the top and bottom of the compartment, so they don't work well for multi-level cooking, as items placed on the top shelf prevent heat from reaching the top of items on the bottom shelf, and vice-versa.

In your case I believe you have two options:

  1. Tip out most of the liquid from the meat roasting pan and roast the potatoes with the meat. A layer of fat a few mm deep is desirable. This might, however, cause your roast to dry out, so you would have to be diligent in basting the meat.

  2. Take the meat out to rest, and then cook the potatoes. If you turn your oven up to around 200°C, you can roast the potatoes (assuming you pre-boil them, and you should) in about 45 minutes. The meat will cool a little, but it will be well rested, and a bit of hot gravy will compensate for the heat loss anyway.

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the potatoes will cook through in much less time if you use small potatoes or cut them to pieces –  rumtscho Jan 10 at 9:34
    
If you boil them fully, they are cooked through anyway - the purpose of roasting is then just developing a good crust (and improving flavour by absorbing tasty tasty fat and juices). Potatoes roasted from raw are, in my opinion, terrible. –  ElendilTheTall Jan 10 at 9:46
    
Maybe we are using different potatoes or different roasting methods then. I have no trouble with potatoes roasted from raw, especially baby drillinge are great, just put them whole with some lard in a preheated cast iron pan and bake to 96 celsius internally, usually under 20 minutes. –  rumtscho Jan 10 at 10:00
    
And use Bake not Broil, Broil is to grill and you will end up with burnt everything... –  Recycled Steel Jan 10 at 11:25
    
@rumtscho skin on is a different matter, as the potatoes don't dry out as easily. But it's pretty rare to have a roast with skin-on roast potatoes! –  ElendilTheTall Jan 10 at 16:16
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To make really crispy roast potatoes you need very high heat, which is bad for your meat, therefore you will need to take the meat out and roast the potatoes while the meat rests. You should be resting your meat anyway, for beef and lamb at least 45 minutes to an hour under a foil tent or wrapped in foil. This gives plenty of time to blast the potatoes.

In the UK it's traditional to par-boil the potatoes until they start to get tender, then drain them and rough them up before roasting them in oil or fat for about 45 minutes. This gives you potatoes that are tender on the inside and crispy on the outside. For best results use a medium moisture potato, and an oil or fat with a high smoke temperature. Maris piper or king edward potatoes are popular in the UK, in the US I've found Yukon Golds to work, or any white potato variety. Here's a decent guide.

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I have never rested it for so long, 45 minutes. The meat will be cold by then. Here is a procedure I am thinking of, let me know what you think: Put in the roast with a thermometer, relatively low heat (350 F) until I get my internal temperature right. Then I remove the roast from the oven and let it rest for 45 minutes. While that is going on, I am going to roast the potatoes (450 F for 45 minutes?). When the potatoes have reached the correct tenderness and consistency, I will put the meat back into the oven at high heat (500 F for 10-15 minutes) to crisp the skin of the meat. –  l3win Jan 10 at 18:00
    
You could do it that way, and it may work, but I think you'll find that if you wrap your meat well it will still be nice and warm after 45 minutes. In a fairly small roast the internal temperature only drops about 10 degrees F after an hour. The way you are suggesting has the potential to dry your roast out. –  GdD Jan 10 at 18:34
    
Noted. Thanks for this. –  l3win Jan 10 at 21:11
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I always roast my meat on a rack placed over a roasting tin - the tin beneath then has the roast potatoes cooking inside. If the meat I'm roasting is fatty, as in duck, then I'll cook it on its own for 45 minutes or so, empty out the fat in the tin, add the potatoes and return to the oven. It may or may not be necessary to empty out more fat as cooking proceeds because you're right, too much fat in the tin means soggy potatoes. The trick is simply to keep an eye on it and empty out any excess as cooking proceeds. Not usually a problem with roast chicken, but lamb sometimes can produce a little too much liquid fat. I usually remove the meat when its done and let it rest, and in that time, the potatoes will be on their own in the oven, turned up a bit higher if they're not as crispy as I'd like, but usually, I don't have to do that. As for cooking the potatoes separately but directly beneath the meat tin, my experience is the same as yours, despite having a fan oven - they don't crisp and they take longer to cook. My belief is that the tray above blocks heat access because its solid, unlike an oven rack.

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