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2 tablespoons white wine vinegar

1 small shallot, diced (about 3 tablespoons) 

2 teaspoons Dijon mustard 

1/4 teaspoon kosher salt 

Freshly ground black pepper 

3 tablespoons extra-virgin olive oil 

2 radishes, sliced 

1 small tomato, diced 

1 green onion, dark green parts only, sliced 

1 small avocado, diced 

1 head Boston lettuce, torn