No Irish chef could talk about vegetables without mentioning the special place of potatoes in the national diet.
When I was growing up, there were only a couple of types of potatoes used in Irish households: one was what we called the ‘reject’ and the other was termed ‘floury’.
The rejects were small, new potatoes that were rejected by the farmer. Once cheap, today these potatoes are used widely in restaurants and have become much more pricey. Floury potatoes were so termed because they burst their jackets when boiled (if over-cooked, they fall apart completely). But, if caught in time, strained, buttered and cooked for a further ten minutes, they are delicious.
Today, there are so many varieties of potato available that chefs need specialist knowledge to get the right potato for each dish. For example, I use Roosters and Maris Piper to cook potato souffle. Roosters are a tasty red potato with pale yellow, dry, floury flesh, while Maris Pipers have a creamy skin and flesh, and a floury texture. For the souffle, the Rooster is cooked in a fondant stock and the Maris Piper is pureed. Combined, they provide a good balance of bite and softness.
The time of year is another factor to be considered when choosing potatoes for a dish, as the temperature affects the solid components of the potato and its water content. At any given time of year, the staff in Madding’s at the Dublin Corporation Market are always on hand to help me choose the right potatoes for the restaurant.
Did someone mention chips? Ah, chips is a word that has been haunting me since the time of the rugby Six Nations last year. Since then, I have become known as the chef who doesn’t serve chips – but this is not strictly true. What is true is that I won’t serve chips unless they are the best I can make.
The perfect chip requires the perfect potato. Large Maris Pipers are good at this time of year. They should be washed in cold water, peeled and cut into 8cm by 2cm pieces, then dried in a clean cloth or kitchen paper. Next, blanche them in sunflower oil for five minutes.
Then, turn up the heat on the chip pan and cook the chips until golden brown (approx five minutes). Remove, place on kitchen paper, season with salt and serve them in a paper cone with ketchup (Heinz is best). If you make chips from a potato with a higher water content than Maris Pipers, they can be soggy and will stick together like paste.
Purple potatoes were produced in Sligo up to a few years ago, and I found them brilliant for making chips. I cooked them with their skin on so they wouldn’t lose colour. The following dish is my take on fish and chips, but for this, you won’t need ketchup.
Fillet of cod with golden potato, prawn bisque and sabayon, serves four
Ingredients
4 pieces of cod – about 120g each
4 Maris Piper potatoes
30g clarified butter
10g potato starch
Sea salt
Fresh ground white milled pepper
2 lemons
20ml olive oil
1 egg
Method
1. Butter a tray and cover with parchment that has been cut into the same size as the cod fillets. Butter the paper and season. Place the cod on top. Season the cod and brush with egg wash.
2. Wash and peel the potatoes, then slice them thinly with a small cutter. Place the potatoes in a pot and bring them to the boil; cook for one minute only. Remove from the heat and refresh the potatoes under running water.
3. Dab the potatoes dry with kitchen paper and place into a pot. Add the potato starch and clarified butter and mix. Arrange the potatoes on the cod and place into the fridge. When the potatoes have cooled, brush with clarified butter.
4. Heat a copper pan and rub the base with olive oil. Place the cod fillet into the pan with the potato side on the bottom and cook until the potatoes are golden brown.
5. Butter a dish and cover with parchment paper cut the same size as the cod. Season the cod, then place it onto a tray and cook in the oven for five minutes at 170 degrees Celsius. Remove from the oven, squeeze the lemon juice on the fish and serve.
Bisque
Ingredients
20ml of brandy
200ml of dry white wine
1kg of prawn shells
1l of fish stock
100g of miripoix
1/2 bulb of garlic
1/2l single cream
2 bay leaves
1 small bunch of thyme
10g of white peppercorns
20g of unsalted butter
Sea salt
Fresh ground white pepper
Method
1. Heat a pot and rub it with olive oil. Add the prawn shells, cook for ten minutes and mix well.
2. Add the miripoix, peppercorns, bay leaves and thyme, and mix well.
3. Flambe with brandy, then add the white wine and reduce the liquid by around three quarters.
4. Add the fish stock, bring to the boil and simmer for four hours, removing any impurities.
5. Remove the liquid and pass it through a fine strainer.
6. Return it to the heat, add the cream and reduce the liquid by three quarters again. Taste and correct the seasoning, before adding the unsalted butter and serving.
Sabayon
Ingredients
3 eggs
10ml truffle juice
20ml of dry martini
30ml of water
Sea salt
Milled white pepper
Method
1. Break the eggs into a stainless steel bowl, mix with a whisk, season and add the truffle juice, dry martini and water.
2. Whisk over a hot hob until light and cooked, then serve.
Garnish
Six baby artichokes, cleaned and blanched. Cut in half, season and finish off with olive oil.
To serve
1. Arrange the veg on the plate.
2. Add the sauce to the plate and spoon over the sabayon.
3. Place the cod fillet with potato topping on the sabayon and serve.
Kevin Thornton is a Michelin-starred chef and owner of Thornton’s Restaurant on St Stephen’s Green in Dublin. www.thorntonsrestaurant.com