Remove the cream cheese from the fridge and let it come to room temperature. To speed up the process, microwave it for 20-30 seconds.
Add the cream cheese, mayonnaise, and heavy cream to a medium bowl and whisk together until smooth.
Finely mince the kamaboko, roughly chop the water chestnuts, and slice the scallions into thin rounds
Add all ingredients (kamaboko, cream cheese, mayonnaise, heavy cream, water chestnuts, scallions, and dashi powder) to a medium bowl.
Mix until combined.
Cover the bowl with plastic wrap and place it in the refrigerator for at least 30 minutes to let the flavors meld.
Once chilled, enjoy with Ritz crackers. You can also serve the dip with other crackers, with chips, or with vegetable crudités such as celery, carrots and tomatoes.