Gather all your ingredients. Chop the green onions and dill finely and break the smoked trout into small pieces.
In a large mixing bowl, combine the skim ricotta and low-fat sour cream. Blend until smooth and creamy.
Gently fold the smoked trout pieces into the ricotta and sour cream mixture. Add the chopped dill, green onions, horseradish, lemon juice, and black pepper. Mix until well combined.
Taste the spread and adjust the seasoning if necessary, adding more lemon juice or horseradish if desired.
Transfer the spread to a serving bowl and cover it. Chill in the refrigerator for at least 30 minutes before serving.