2 pounds zucchini (trimmed and cut crosswise into thirds) 3/4 cup chopped onion 2 garlic cloves, chopped 1/4 cup olive oil 4 cups water 1/3 cup packed basil leaves
Prep: Skin from half of zucchini with slicer toss with 1/2 teaspoon salt and drain in a sieve until wilted, at least 20 minutes. Coarsely chop remaining zucchini.
Cook onion and garlic in oil in a 3- to 4-quarts heavy saucepan over medium-low heat, stirring occasionally, until softened, about 5 minutes.
Add chopped zucchini and 1 teaspoon salt and cook, stirring occasionally, 5 minutes.