Toast the sesame seeds in a large dry skillet over medium heat, stirring occasionally, 4 to 5 minutes. Transfer to a blender and add the lemon juice, 1 tablespoon sesame oil, the maple syrup, soy sauce, ginger and 3 tablespoons water; pulse until smooth. Set aside.
Add the remaining 1 tablespoon sesame oil to the skillet and heat over medium-high heat. Add the wheat berries and stir-fry until golden, about 5 minutes. Add the snap peas and scallions; stir-fry until crisp-tender, about 3 minutes. Transfer to a large bowl. Add the turkey, carrot, lettuce and sesame dressing; toss to coat.