Prepare ambrosia: place fruit in a smoothie maker or food processor.

Pulse until mostly smooth.

Transfer to a large bowl; stir in remaining ingredients.

Prepare caramelized walnuts: in a frying pan over low heat, melt butter.

Add honey, walnuts, and salt.

Cook for three to five minutes, stirring often, until browned.

To serve, spoon about half a cup ambrosia into individual bowls or cups. Top with caramelized walnuts.