Finely chop large berries. Small ones (any blueberry or currant is a small berry) do not need to be cut, just remove the stems.

Place all ingredients in a bowl and beat to soft peaks with a regular mixer (or 5 minutes in a planetary mixer).

Place the whipped mousse in the refrigerator for half an hour.

Serve garnished with mint leaves, pieces of cookies, and ground nuts to taste.