After fifteen years at the log house, which was surrounded by goat farms but miles from a grocery store, it's nice to be back in the city. Within blocks of our house, we have an Asian supermarket, a Middle Eastern market, a fromagerie, a fish market, and a Whole Foods. A few blocks farther afield, Tropical Foods Market offers all the goodness of the Caribbean, with plenty of specialty ingredients for the African and Latino populations that live in the community as well. Among the items that were hard to find in Rhode Island, chayote squash is one of my favorites, and I now have multiple sources, including my regular grocery store. Chayote, a light green squash that looks like someone punched in the bottom end, always needs to be cooked before eating; it's more firm than zucchini, closer to a patty pan squash, and you can swap zucchini or patty pan squash in most recipes that call for chayote. Here I've paired the mild-flavored squash with creamy avocado and tangy strawberry, in an unusual fresh salsa that tastes great with fish or grilled chicken. You can cook the chayote ahead and refrigerate it, but don't put the salsa together until an hour or so before you're ready to serve; the salt will draw liquid out of the fruit and vegetables, and make it a bit watery if it sits around.