Ingredients
2 tablespoons (1/4 stick) butter
2 cups thinly sliced leeks (white and pale green parts only; about 3 medium)
1 7- to 8-ounce white-skinned potato, peeled, diced
3 cups (or more) low-salt chicken broth
2 cups (packed) coarsely chopped watercress with some of stems plus small sprigs (for garnish)
1 cup (packed) baby spinach leaves
1 1/2 teaspoons fresh lemon juice
2 hard-boiled eggs, peeled, chopped (for garnish)

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