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© Meredith Corporation. All rights reserved. Used with permission.
Place oil, onion and 1/8 teaspoon salt in a small saucepan over medium heat. Cover and cook, stirring occasionally, until the onions are very soft and starting to brown, 12 to 15 minutes. Reduce heat to medium-low if they are browning too much. Stir in balsamic vinegar and simmer, uncovered, until it is reduced to a glaze, 1 to 3 minutes.
Whisk yogurt, mayonnaise, white-wine vinegar, shallot, pepper and the remaining 1/2 teaspoon salt in a small bowl.
Divide romaine halves among 4 dinner plates or place on a large platter. Spoon the dressing over the salads. Break sardines into two or three pieces each and divide among the romaine halves. Top with the caramelized onions and tomatoes.