Bring a pot of water to a rolling boil and cook your noodles.
Meanwhile, make the sauce - start by slicing the cucumber in half and use a spoon to scrape out the flesh, directly into a blender.
Slice the remaining cucumber into crescent moons and divide equally between two serving bowls.
To the cucumber flesh, add the peanut butter, dark soy sauce, sriracha, sesame oil, lime juice and grated ginger and garlic.
Blend until you have a completely smooth sauce.
Pour the sauce into your serving bowls, then add the cooked noodles to each and toss to coat evenly.
Serve with your choice of garnish - I like to add chopped coriander, spring onions and a spoonful of chilli crisp for a bit of extra heat.