This vegetarian stew shows off some of the season's freshest vegetables, includingasparagus, carrots, and artichokes -- all afloat in a light vegetable broth.Sweet-potato dumplings make hefty fixings to dig into.
Makethedumplings: Place sweet potato in a saucepan; cover with water by1inch. Bringto a boil; add a large pinchof salt. Reduceheat; simmer until tender,about 15 minutes. Meanwhile,whisk theflour,bakingpowder, 1 1/2 teaspoons salt,andapinch of pepper in a bowl; set aside.
Drain sweet potato. Pass through a ricer onto a baking sheet. Spread out; let cool 15 minutes. Transfer to a bowl. Stir in eggs and parsley. Add flour mixture; stir just until a sticky dough forms.
Meanwhile, make the stew: Fill a medium bowl with cold water. Squeeze juice of 1 1/2 lemons into water; add rinds. Remove and discard tough outer leaves from 1 artichoke. Cut off top third; peel stem. Halve artichoke lengthwise; remove fuzzy choke, and discard. Cut into 1-inch-thick wedges, and place in lemon water. Repeat with remaining artichokes.
Melt butter in a medium stockpot over medium heat. Add onions; cook, stirring occasionally, 3 minutes. Add Parmesan rind. Drain artichokes; add to pot. Stir in stock and 4 1/2 cups water; add salt and pepper. Bring to a boil. Add carrots. Reduce heat; simmer, partially covered, 10 minutes. Squeeze remaining 1/2 lemon into pot; stir in tarragon.
Using 2 spoons, form 18 dumplings, dropping into stew as you work. Cover; cook 7 minutes. Add asparagus. Cook, covered, until the dumplings are cooked through and vegetables are tender, about 3 minutes. Remove rind before serving.