Set aside ¼ of the 150 grams uni and then put the rest in a bowl and mash it with a whisk; it doesn't need to be smooth. Then you want to gently whisk in the cream.
150 grams uni, ⅓ cup light cream
Bring 10 cups of water to a boil and add 1 teaspoon of salt.
Add the 200 grams spaghetti and boil for 2 minutes less than the time specified on the package instructions. For example, my spaghetti takes 11 minutes to cook, so I'm going to set the timer for 9 minutes.
200 grams spaghetti
About 3 minutes before the spaghetti is done, place a skillet over medium-high heat and add the 2 tablespoons olive oil, 7 grams garlic, and 5 grams anchovy filets. Sauté until the garlic is fragrant but hasn't started to brown yet.
2 tablespoons olive oil, 7 grams garlic, 5 grams anchovy filets
Turn down the heat and add the 1 teaspoon soy sauce; it will spatter, so be careful. When most of the liquid is gone, add the ¼ cup sake and then turn the heat back up, bringing the mixture to a boil to burn off the alcohol.
1 teaspoon soy sauce, ¼ cup sake
When the timer is up, transfer the cooked pasta directly to the skillet with the garlic, and then add a ladleful of pasta cooking water. Cook the spaghetti like risotto, adding additional pasta water as needed and stirring until it reaches your desired doneness (another 2-3 minutes).
Stir in the uni and ⅓ cup light cream and toss to coat the cooked spaghetti until it forms a creamy sauce.
Serve the uni pasta topped with a few pieces of uni and garnish with 5 leaves green shiso cut into a chiffonade (thinly sliced).
5 leaves green shiso