Place the cucumber and avocado in a separate bowl.
In a mini processor, process the dressing ingredients together until mostly smooth.
Pour dressing onto vegetables - in both bowls - and stir well. (Reserve some of the dressing to drizzle over the salad when serving.) Season to taste with salt.
Using a round mold (you can use a cookie cutter), first layer the tomatoes, then the cucumber and avocado, and lastly add the hemp seeds. Carefully remove the mold. Pour the reserved dressing on top carefully, to make sure you don’t break the form. Serve and enjoy!