Saturday, 6 April 2013

Cheesy Au Gratin Potatoes

Ingredients:
3 large or 4 medium rooster potatoes (or any similar 'floury' potato)
45g real butter
25g flour
3g salt
dash cracked black pepper
180g grated cheddar cheese
475ml whole milk
A large gratin or casserole dish

This is a favourite side dish that I make regularly - at least once a month or so.  It's so versatile & we've had it with every type of meat & poultry, as well as with fun food like sausages, fish fingers, chicken nuggets & battered fish.  It's very more-ish & not the least bit low fat, so watch out!  The key is using real butter, whole milk & full fat cheese as the sauce simply won't thicken if you use low fat substitutes.  I learned this the hard way!

Method:
As with many of my cheese or cream-based sauces, this starts with a simple roux, but first I would suggest preparing the potatoes & having all of the ingredients of your cheese sauce pre-measured & ready to add in.  This will enable you to keep stirring when you need to & prevent something burning or sticking while you turn around to weigh or measure something.  First, wash & peel the potatoes, cut into halves or quarters & slice into 1/4 inch thick half-rounds.  For the smaller ends of the potatoes or if you're using a larger amount of smaller potatoes, you can simply cut rounds.  Fill the dish with these raw thin slices of potato.  For the roux, melt the butter on a medium heat.  When the butter is fully melted, add in the flour, pepper & salt together.  Stir constantly with a whisk (I highly recommend a 'Wonder Whisk' for this - it's the best for the job) for 1 minute in order to thicken the roux & cook out the flour taste.  The roux should be bubbling a little while you stir, but if it's bubbling intensely, simply turn the heat down a little.  Once you've whisked for 1 full minute,  pour in all of the milk at once.  Stir for a few seconds with the whisk & then switch to a spoon.  Stir regularly for roughly 5 minutes until the mixture thickens considerably.  Once it has reached a thickness that you're happy with, dump in your grated cheese (a good strong or mature cheddar gives the best result).  Stir again for just a minute or so until all the cheese is melted & blended in.  Pour the cheese sauce over the sliced potatoes & ensure they are fully covered.  Cover the dish with foil & cook at 200 Celsius (390 F) for 1 & 1/2 hours.  It's as simple as that!  It's fool-proof & comes out perfectly every time.  Just be sure to leave enough time - it might be a dish best made on weekends if you don't have 90 minutes to spare on a weeknight.  I did try once or twice to pull them out early in a panic to get dinner on the table, but the potatoes were still partially raw.  It definitely needs the full 90 minutes!  
This feeds the 3 of us for 2 nights with some leftover for lunch or a snack, so it would work well for a large family. 

the butter & flour paste
the thickened mixture after the milk
after the cheese is melted in...
the potatoes before the oven
the finished dish

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