Slice the onion thinly.
Blanch the udon noodles in boiling water, then drain.
Heat olive oil in a pan and sauté the onions.
When the onions become translucent, add fresh cream and bring to a boil.
Add the udon noodles and mix well with the sauce.
Season with salt and pepper.
Turn off the heat and top with flying fish roe.
Finish by sprinkling with parsley or scallions.