Cut the root off the komatsuna and chop into 3cm pieces. Mince the garlic after removing its core.

Boil water in a pot, add salt (not listed in ingredients) and spaghetti. Cook the spaghetti 1 minute less than the package instructions. Reserve 2 tbsp of pasta water and drain the rest.

Heat olive oil in a frying pan over low heat. Add garlic and red chili, sauté until fragrant. Add komatsuna and dried shirasu, stir-fry until the komatsuna softens.