Soy-Simmered Tofu Dumplings with Zucchini and Tomatoes

The idea of dumplings might seem heavy-ish for summer, but when silken tofu is involved and the poaching liquid is studded with seasonal vegetables, you end up with seasonally appropriate comfort fare (even though I sort of don't like that cooking cliché!). The gingery, lemony, slightly sweet simmering liquid is plenty bright but to lighten things up ev…