Tomatoes, tarragon and white wine make a fragrant broth for the scallops in this vibrantly colored easy one-pot stew. Make it a meal: Serve with a simple green salad and sop up the leftover broth with toasted whole-grain baguette.
Pat scallops dry and sprinkle both sides with salt. Heat oil in a large nonstick skillet over medium-high heat. Add the scallops and cook until light brown, 1 to 2 minutes per side. Transfer to a plate. Add onion, celery and garlic to the pan and cook, stirring, until just beginning to soften, about 2 minutes. Add wine and simmer for 1 minute. Stir in potatoes, broth, tomatoes, tomato juice and saffron and bring to a boil. Reduce to a simmer, cover and cook until the potatoes are tender and the tomatoes are beginning to break down, 12 to 14 minutes.
Return the scallops and any accumulated juices to the pan along with tarragon. Cover and cook until the scallops are just cooked through, 2 to 4 minutes.