How to Make It
Bring 5 qts. water, potatoes, bay leaves, and salt to a boil in a large pot over high heat. Reduce heat to medium-low; simmer until potatoes are almost tender when pierced, about 12 minutes.
Add vinegar and cook 2 minutes (this "sets" the potatoes and keeps them from being a starchy mess). Add shrimp and cook just until curled and pink, about 1 minute. Drain potatoes and shrimp, then return mixture to pot off the heat. Discard bay leaves.
Add butter, dill, chives, and pepper, and toss until butter melts. Transfer to a serving bowl and serve with lemon wedges.