- Place kernels in a small pot, add just enough water to barely cover, and bring to a boil. Reduce to simmer until the water is nearly gone.  
- Fill a medium pot halfway with water, place the steamer basket on top, and bring to a gentle simmer.  
- Fold a piece of parchment paper in half like a book and crease firmly.  
- Open and place 2 slices of butter near the crease, then lay seasoned salmon on top.  
- Add shallots, spinach, and one more slice of butter over the salmon.  
- Fold into a sealed half-moon packet using small overlapping pleats around the edge.  
- Place the packet in the steamer basket. Cover and steam on medium-low heat for 10 minutes.  
- Blend the cooked corn with cream cheese and a small pat of butter until smooth.  
- Pass through a sieve for extra silkiness. Stir in chopped parsley.  
- Heat a skillet over medium-high heat. Add a high-heat cooking fat (e.g., avocado oil).  
- Sear zucchini pieces on all sides until golden and tender. Remove from heat.  
- Spoon corn purée in the center of the plate. Lean zucchini around the edge.  
- Carefully remove salmon from parchment and place just off-center on the purée.  
- Drizzle any buttery juices from the papillote over the top. Finish with truffle salt if desired.