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1
Gently place an egg into boiling water and cook for 8 minutes to make a soft-boiled egg.
2
Remove the cooked egg and place it in ice water, allowing it to cool for about 10 minutes.
3
Prepare shredded long green onion: cut lengthwise in half, extract the white portion, and julienne along the grain. Soak in ice water for 5-10 minutes.
4
Prepare the perilla leaf: remove the stem, roll the leaf, cut in half, and slice into thin strips.
5
Prepare the cucumber: slice diagonally first, then julienne into thin strips.
6
Prepare the tomato: remove the stem and cut into strips.
7
Prepare the ham: slice into thin strips.
8
Cook the sōmen noodles according to package instructions. Quickly rinse with cold water and rub gently to remove excess starch.
9
Prepare the dashi broth: mix cold water, white dashi, sugar, vinegar, and olive oil together thoroughly.
10
Assemble the dish: place noodles in a bowl, pour in the broth, then top with tomato, ham, cucumber, egg, and shredded onion in order.
11
Finish with white sesame seeds sprinkled on top. The chilled dashi sōmen is ready to serve.