Place rice in a medium pot and rinse with water until water is no longer white and murky. Drain the rice well and add 2 cups water and salt to the pot.
Place pot over high heat and bring to a boil. Boil rice for 10 minutes, then turn down heat, cover the pot and simmer for 10 minutes. After 10 minutes, turn off heat, leave the cover on and let it rest for 10-15 minutes.
In the meantime, place avocados in a small bowl, and mash with a fork. Add lemon juice, mayonnaise, greek yogurt, salt and mix until smooth and set aside.
When the rice is done, fluff the rice with spoon or fork and transfer to a medium bowl. Add apple cider vinegar and sugar to a small cup and stir to combine. Sprinkle vinegar mixture to the rice and fold rice gently. Set the rice aside to cool completely. Once rice has cooled, fold in dill and or ginger to the rice.
To assemble sushi parfait, layer martini glass with diced cucumbers, avocado cream, then sushi rice. Add four pieces of gravlax, additional diced cucumbers and 3-4 halved cherry tomatoes on top of rice.
Garnish sushi parfait with pickled red onions, micro greens and/or crumbled seaweed. Serve with side of soy sauce.