To make the dressing, combine all ingredients into a small jar. Cover and shake well. Add extra salt and pepper if necessary, to taste.
If you will be eating this salad immediately, place all of the salad ingredients into a large mixing bowl. If you will be prepping the ingredients for several salads for the week, keep each ingredient in a separate small bowl or plastic bag.
Wash and dry the lettuce in a salad spinner or on paper towels. Stack the leaves together and slice or chop them into bite-size pieces, no larger than 1 1/2 inches.
Quarter the apple and cut it into 3/4-inch cubes. If storing it for later, toss the cubes with fresh lemon juice to prevent browning.
Cut the Gouda into 1/2-inch cubes
Cut the entire 1/4 pound of turkey into 1-inch square pieces
Place all ingredients into a large mixing bowl and toss together.
Drizzle with salad dressing as desired, and toss to combine.