Zest the lemon and juice it.
In a medium saucepan, melt the butter over medium heat.
Add the lemon juice, honey, and water, and whisk to combine.
In a small bowl, whisk the cornstarch with a little cold water until smooth, then pour into the saucepan.
Simmer the sauce over low heat until thickened, about 3-5 minutes.
Stir in the grated lemon zest, salt, and finely chopped parsley. Combine well, and cook for an additional 1-2 minutes.
Serve the sauce warm with grilled or baked fish, chicken, or vegetables. It can be stored in an airtight container in the refrigerator for 2-3 days.
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