For the raviolis: In a bowl, combine mushrooms, crab, corn, cream fraiche, chives and lemon zest. Season. Lay out 4 skins at a time and place 1 tablespoon of mix on top. Brush egg wash on the edges and place second skin on top. Press down firmly to seal. Make 12 raviolis. In a pot of boiling, salted water, blanch raviolis for only 2 minutes until heated through.
For the sauce: In a saucepan coated lightly with oil, saute onions, ginger and lemon grass until soft, about 4 minutes. Season and add corn. Stir for 2 minutes, add stock and bring to a simmer. Simmer for 15 minutes or a 20 percent reduction. Using a hand blender or blender, puree very smooth then strain through a fine chinoise. Place back on stove and heat. Montee au beurre and season with juice. Check for flavor.
Plating: On a soup plate, cover with the sauce. Place 3 raviolis on the sauce and garnish with chile oil and chives.
In a non-stick saucepan heat spices until fragrant and just beginning to smoke. Remove from heat and whisk in canola oil. Transfer to a sterilized glass jar to cool. Oil will separate, shake to reconstitute. Will keep in the refrigerator for up to 2 weeks.