Heat oil in pan. On medium heat add potatoes a few slices at a time so they don't stick together.

用炒锅中温热油，依次加入几片土豆翻炒，使不粘连。

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Other passers-by add potatoes, onions and so on until the soup really is delicious, and is served to all.

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Add the sweet potatoes, cleaned leeks and plenty of ginger to the clear broth and bring it to an aggressive boil.

WSJ: Amaryll Schwertner's Poached Halibut in Dashi With Leeks, Sweet Potatoes and Sesame Seeds | Slow Food Fast

Add the torn black kale when the potatoes are almost cooked through.

WSJ: Amaryll Schwertner's Poached Halibut in Dashi With Leeks, Sweet Potatoes and Sesame Seeds | Slow Food Fast