This delicate little starter from Sam Yorke is filled with a jet black nori crème pâtissière, plum jelly and raw langoustine. Since the langoustine isn't cooked, make sure you get langoustine that's safe to eat raw.
For the croustade butter, blend everything except the melted butter together
Stream in the melted butter while whisking to emulsify, then set aside to rest for 2 hours
For the crème pâtissière, first lightly toast the nori sheet with a blow torch or over a gas burner
Blend the nori to a fine powder
Add the milk, cream and lemon zest to a saucepan. Bring to a simmer
In a separate bowl, whisk together the yolks, sugar and cornflour
Pour the hot milk mixture over the egg yolks while whisking
Pour the mixture back into a clean saucepan and cook to 90ºC, stirring constantly with a spatula
Remove from the heat and add the butter and nori powder. Whisk to combine
Pour onto a tray to chill. Once cool, transfer to a piping bag
For the plum jelly, bring all the ingredients except for the agar agar to the boil in a round bottomed saucepan
Add the agar agar, then whisk for 30 seconds whilst boiling
Pour onto a flat metal tray keeping it as level and even as possible until it sets. It should be around 1 mm thick
Chill in the fridge, then cut out into rounds with a metal cutter that’s slightly narrower than the opening of the croustade
For the plum gel, season the plum juice with the salt, sugar and vinegar
Use a hand blender to blend the ultratex into the mixture to thicken, adding it a teaspoon at a time
Once it is just a little looser than desired, leave the mix for 5 minutes to allow the ultratex to bloom further
Hand blend again so that it is smooth and shiny, but not so thick that it feels claggy when tasted
Transfer to a piping bag
Combine the langoustine and fresh plum. Season with salt and rice wine vinegar to taste
Heat enough oil to deep fry the croustades in a high-sided, heavy-bottomed pot to 150ºC
Heat up the croustade iron in the oil, dip the hot iron into the croustade batter twice, then place it back into the oil to cook for 3 minutes
Remove the iron from the oil. Slide off the croustade cup to drain on a paper towel
Pipe the nori crème pâte into the croustade cup until it’s halfway full. Fill the rest with the langoustine mix
Top off with the plum jelly and a dot of the plum gel
Garnish with a slice of fresh plum and serve quickly to avoid the croustade going soft
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