Slice the red onion thinly.
Soak the sliced red onion in cold water for 10 minutes to reduce its sharpness.
Put sour cream, cream cheese, lemon juice, salt, and pepper into a bowl and mix until smooth.
Drain the red onion using a sieve to remove excess water.
Layer the red onion and cream sauce alternately in a glass or cup.
Garnish with parsley or herbs to finish.