This summery pasta dish makes good use of tomatoes, arugula, and physalis, otherwise known as cape gooseberry. This unfamiliar fruit is common in South America, particularly Peru, where it is prized for its flavor as well as purported medicinal properties. If you can't find physalis, you can use the other type of gooseberry, sometimes found in supermarkets, or cranberries, which share a similar tartness. You can use regular pasta rather than the olive variety called for, too.