Start by making the dark chocolate Lego minifigures. Break the dark chocolate into pieces and place it in a microwave safe bowl.
Melt the chocolate by cooking in the microwave for 30 second bursts, stirring between each one to ensure it melts evenly. Be careful not to overheat or burn the chocolate, heat only until just melted and smooth.
Carefully spoon the melted chocolate into a Lego minifigure shaped silicone mould. Tap the mould on the counter to remove any air bubbles from the chocolate, then place the mould in the fridge to set whilst you make the rest of the lunch.
Next make the Emmet sandwich. Make up a sandwich with two slices of bread. I filled mine with cheese, but you can use any filling of your choice.
Using a sharp knife, cut the sandwich into a Lego minifigure head shape.
Using the sandwich as a guide, cut a Lego hair shape from the crust end of the bread.
Place the sandwich on top of a slice of cheese and cut around it. Pop the cheese on top of the sandwich to make the yellow Lego face.
Add the bread crust Lego hair on top of the sandwich. You can secure this in place with a little cream cheese or mayo if wanted.
Using edible marker pens, draw on the face features.
Transfer the sandwich to your lunch box, then make the fruit and vegetable Lego blocks.
For the vegetable Lego blocks, cut the carrot and cucumber length-ways into rectangle pieces.
Using a tiny round bento cutter or the end of a drinking straw, press circles into the vegetable pieces to look like Lego blocks.
Repeat with the pineapple and melon to create fruit Lego blocks.
Add the fruit and vegetables to the lunch box, then carefully push a couple of the dark chocolate Lego minifigures from the mould and add to the lunch box to finish.