First, add the walnuts, peanuts, and cashews to a food processor or a high speed blender. Pulse the nuts for about 15 seconds, or until they are roughly chopped.
Then pour the nuts into a medium sized bowl. Add in the honey, using a spoon to gently toss it in with the nuts. Add in the salt and continue tossing until the nuts are coated and start to form clumps. Drizzle a little extra honey if needed and set the bowl aside.
Then melt the chocolate in a non-stick pan or over a double boiler on medium low heat. Stir the chocolate constantly until it is completely melted to avoid burning it.
Take a silicone mold and place it on a baking sheet. Use a spoon to evenly distribute the chocolate in each mold, filling it about ¼ - ⅓ the way full. Then spoon a generous amount of nuts into each mold, gently pressing the nuts down into the chocolate.
Next, use a spoon to drizzle the remaining chocolate on the tops and lightly sprinkle the tops with course sea salt, if desired.
Finally, cover the mold with plastic wrap and place it in the refrigerator for 2 hours to completely set. Remove the mold from the refrigerator and gently pop out each chocolate. Allow the chocolate to thaw before eating.