Preparation Whisk together oil, lemon juice, shallot, and 1/4 teaspoon each of salt and pepper in a large bowl. Add tomatoes, purslane, and parsley, gently tossing to coat. Cooks' note:Herbs and greens can be washed and dried 1 day ahead, then chilled in sealed plastic bags lined with paper towels. Toss with tomatoes and vinaigrette just before serving.
Preparation Whisk together oil, lemon juice, shallot, and 1/4 teaspoon each of salt and pepper in a large bowl. Add tomatoes, purslane, and parsley, gently tossing to coat. Cooks' note:Herbs and greens can be washed and dried 1 day ahead, then chilled in sealed plastic bags lined with paper towels. Toss with tomatoes and vinaigrette just before serving.