Boston Lettuce Avocado Salad with Lime Dressing

For the salad :
2    small to medium heads Boston lettuce, discard any wilted leaves
1    Hass avocado, pitted
1    large bunch scallions, thinly sliced
Leaves from 1 bunch cilantro, finely chopped

For the dressing :
2    limes, juiced
¹/3  cup extra-virgin olive oil
½   teaspoon salt
1    teaspoon sugar
About 20 grinds fresh black pepper
1    tablespoon Passover mustard

Pull the lettuce leaves from the head, rinse gently under cold water, and lay out on clean towels to dry.  Use a spoon to remove the flesh in 1 piece from each half of the avocado.  Thinly slice the avocado flesh into thin wedges.

Whisk together all the dressing ingredients.

Arrange the lettuce leaves on a plate and top with the avocado wedges, scallion, and cilantro.  Finish with a healthy drizzling of the dressing.