Roasted Jerusalem artichokes with browned butter mayo

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Jerusalem artichokes. Once they were just a humble root vegetable used for peasant food and then suddenly it’s a gourmet vegetable.

Fine with me; I really like the earthy sweet taste. And if you have a plot of land to grow your own, it’s, according to my mother, the easiest vegetable to grow as it spreads like weed.

I usually use them for soup as I never get tired of the comforting flavour it has, but sometimes I roast them in the oven. Last time I made sort of a sharing dish with browned butter mayonnaise and grated comté. It’s very simple to make (apart form the mayo) and feels luxurious despite the simple ingredients.

Just a note about the mayonnaise: it’s just as easy to make as regular mayonnaise but make sure the butter has cooled down before incorporating into the mayo. And please make it just before serving as mine split after a while in room temperature. It’s not a huge problem though, as you don’t really want to leave any of it – it’s that good!

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Roasted Jerusalem artichokes with browned butter mayonnaise, serves 2 (starter size portions)

200 g small Jerusalem artichokes, washed 

oil for roasting

salt and pepper

grated comté

2 lemon wedges (optional)

Cut the artichokes in half lengthways. Place in a roasting tin and drizzle with some oil. Add salt and pepper and stir around so all pieces are coated with oil and seasoning. Roast in 225C until soft but with crunchy exterior, approx 20 minutes. 

Serve with the mayo below and grated comté. And maybe some lemon juice. 

Browned butter mayonnaise

100 g butter

1 egg yolk, at room temperature

1 tsp dijon mustard

1 tsp white wine vinegar

approx 3 tbsp neutral oil

1/2 lemon

salt, white pepper

Brown the butter and let cool until room temperature. Whisk egg yolk, mustard and vinegar in a bowl. Add the oil drop by drop while whisking. Once you have the start of a mayonnaise, add the butter little by little while whisking and letting the mixture thicken. Season to taste with lemon juice, salt and pepper. Serve immediately. 

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