-
1
Bring a large pot of lightly salted water to a full boil. The water is salted only lightly: karasumi will supply all necessary seasoning in the finished dish. Cook the spaghettini or linguine until al dente according to the packet time, then reserve 60 ml of the cooking water before draining. The pasta is done when it offers a clean, slight resistance at the centre when bitten.
-
2
While the pasta cooks, warm the olive oil in a wide pan over low heat. Add the minced garlic and togarashi to the cold or barely warm oil and raise the heat gently, blooming both in the oil until the garlic is softened and fragrant but not coloured. The garlic must remain a background note; the moment it colours it has gone too far. The cue is a soft, sweet garlic scent without any sharpness of browning.
-
3
Add 3–4 tablespoons of the reserved pasta cooking water to the pan and stir to begin emulsifying the oil. Add the drained pasta and toss continuously over medium heat until every strand is coated in a cohesive, lightly glossy sauce. This is where the dish lives or dies: without adequate pasta water the oil will not emulsify and the strands will be slicked rather than coated; too much water and the sauce turns thin and loose. The correct state is a light, even gloss that clings to the pasta and does not pool at the bottom of the pan.
-
4
Remove the pan from the heat. Add the finely grated or shaved karasumi and toss immediately to distribute it evenly through the pasta. Coarse pieces must not be used: even coverage is the measure. The roe will dissolve partially into the sauce, seasoning every strand; the dish requires no additional salt at this stage. The correct result is a uniform, ocean-scented coating without perceptible pockets of saltiness.
-
5
Add the shiso chiffonade at the very last moment, tossing once. The shiso's volatile aromatics dissipate within thirty seconds of contact with residual heat; the dish is ready when the herbal fragrance of the shiso is still vivid and immediate on lifting the pan.