Easy recipe Chilled Watercress-Spinach Soup

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about two tablespoons (one quarter stick) butterabout two cups thinly sliced leeks (white and pale green parts only about three medium)one about seven- to eight-ounce white-skinned potato, peeled, dicedthree cups (or more) low-salt chicken brothabout two cups (packed) coarsely chopped watercress with some of stems plus small sprigs (for garnish)one cup (packed) baby spinach leavesone one/about two teaspoons fresh lemon (Recipes by ingridients lemon) juiceabout two hard-boiled eggs, peeled, chopped (for garnish). .