Pour 1/2 cup water into a small bowl and sprinkle gelatin powder over the surface. Let it sit undisturbed for 2-3 minutes to bloom.

In a small saucepan, combine whole milk, sweetened condensed milk, sugar, and salt. Heat over medium heat, stirring occasionally, until steam rises but the mixture does not boil (about 5 minutes).

Add the bloomed gelatin to the hot milk mixture and stir constantly for 1-2 minutes until completely dissolved and smooth.

Remove from heat and stir in vanilla extract. Taste and adjust sweetness if needed.

Pour mixture into a heatproof bowl and let cool to room temperature, stirring occasionally, about 10-15 minutes.

Once cooled, gently fold in fresh fruit and chopped nuts, if using, until evenly distributed.

Carefully pour the mixture into a gelatin mold or glass dish, tapping gently to release any air bubbles.

Cover loosely with plastic wrap and refrigerate for at least 4 hours, or until set and slightly wobbly.