Combine the vinaigrette ingredients in a bowl and whisk until smooth.
Slice the large tomatoes horizontally, discarding the ends.
Arrange half of the large tomato slices with half the avocado and mozzarella on a rimmed platter or bowl. Drizzle with half of the vinaigrette.
Continue with another layer of large tomatoes, avocado, mozzarella, and quartered cherry tomatoes.
Drizzle the remaining dressing and top with finely chopped basil.
Each serving has 3.7 net carbs if using keto friendly sweetener.
Serving: 1 cup (nutrition calculated using sugar free maple syrup), Calories: 237kcal, Carbohydrates: 6.7g, Protein: 8.3g, Fat: 19.8g, Cholesterol: 20.2mg, Sodium: 144.8mg, Fiber: 3g, Sugar: 3.1g