Preheat the oven to 175C/347F.
Line a baking sheet with parchment paper and add the black lentils.
In a small bowl mix the coconut oil with the wasabi, then drizzle the mixture over the lentils.
Toss to combine and roast for 15 minutes, until crispy. Remove from the oven and set aside to cool.
While the lentils are roasting, prepare the soup.
Water-fry the onions and leeks into a medium soup pot, then add the vegetable broth and bring to boil over medium heat.
Simmer over low heat for five minutes, then add the miso paste and asparagus and mix to incorporate.
Simmer for one more minute, then transfer into the blender.
Add parsley, spinach, ginger and garlic, and pulse to obtain a creamy liquid.
Divide into serving bowls, top with wasabi lentils and radish slices and serve.