Rostis - how far in advance?
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Output Flange

Original Poster:

17,023 posts

237 months

Wednesday 23rd December 2015
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I need to make 9 potato rostis for Boxing Day. Can I make them tomorrow, cook them, stick them in the fridge and then reheat on Boxing Day, or will they go limp and rubbish?

mattdaniels

7,362 posts

308 months

Wednesday 23rd December 2015
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I've never had success doing that but that might just be me. Now is not the time to experiment but my suggestion would be to make up the rostis and freeze them raw, and fry from frozen.

21TonyK

13,124 posts

235 months

Thursday 24th December 2015
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Agree with Matt. Any time I've cooked rostis in advance they turn grey inside even if they do crisp up again.

mattdaniels

7,362 posts

308 months

Thursday 31st December 2015
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I appreciate it's too late now but thought I'd boing this as I used frozen rostis in my breakfast this morning.

I freeze them raw, wrapped separately in greaseproof paper, wrapped in cling.





They fry straight from frozen. My tip is don't use much oil and don't have it too hot - exactly the same as if you were doing them from fresh. They obviously take a bit longer but that's about it. Pretty straightforward.


zygalski

7,759 posts

171 months

Friday 1st January 2016
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Back in the day when I used to have to make 30 of them every night, what we did was have them all made up by about 6pm & they were good for about 3 hours or so.
We made them by coarsely grating raw desiree potatoes, seasoning well with salt & then squeezing out the excess water in a dishcloth. Put the dry shredded potato in a bowl & add some black pepper & a fair amount of clarified butter, maybe 200ml for about 2lb of spuds. Mix well & then we used to fry them in individual small blini pans (or you could use several rings in a large pan) pushing down with a teaspoon all over & also adding a bit more clarified butter if needed! After about 4 or 5 minutes flip them over & do the same again. I used to cook them on a medium heat for a decent time until darkish golden brown. That way you know they are going to have maximum crunch & be thoroughly cooked all the way through. The finished rosti should be a maximum of about 1cm thick, if you want a decent texture.
They used to stay crunchy for several hours stored in a warm place, uncovered on a tray with a cloth under them. To store any longer I suspect you'd have to cook them slightly less in the first place, allow them to cool & then re-fry them nearer the time, to finish. Just avoid under cooking them or making them too thick, as that can lead to a nasty grey layer of potato in the middle of the rosti.