Mix all the sauce ingredients in a bowl. Season with salt and pepper to taste. Set aside.
In another bowl, add Nordic shrimp, tomato, radishes, beet and shallot. Add creamy dill sauce to taste. Stir gently. Season to taste.
Assemble tartare using a cookie cutter. Garnish with radish slices and green onion.
Deseeding the tomato removes much of its water content. This prevents the mayonnaise or dressing in your tartares, salads and bruschetta from becoming too runny the following day.