Salad: Mix all ingredients together in a large bowl.
Dressing: In a large bowl, whisk together the mayo, oil, vinegar, lemon juice, anchovy paste, onion, cheese, erythritol, garlic salt, table salt, and oregano. Use an immersion blender (or continue whisking by hand) to combine all the ingredients. Refrigerate in a glass jar for at least 2 hours before serving. Good for 5 days in an airtight glass jar.
Notes
Make dressing at least 2 hours prior to serving. Keto-friendly recipe.