Arrange oven rack to middle position. Preheat broiler.
Heat butter in cast iron pan over med/high heat until melted.
Add garlic and sauté for a minute, until fragrant.
Add honey, water, soy sauce and lemon juice; stir to combine.
Add the salmon fillets to the sauce in the pan skin side down, and cook for 3-4 minutes, basting the tops with pan juices.
Baste salmon one more time then transfer the pan to the oven to broil for a further 5-6 minutes, or until tops of salmon are nicely charred and salmon is cooked through.
After plating the salmon, drizzle with pan juices and add a squeeze of lemon.