Preheat the oven to 350F (180C).
In a saucepan bring to a simmer the whipping cream and lavender. Let it infuse for 10 minutes.
In a large bowl mix together the melted butter, sugar, salt, cornmeal, honey, and vanilla extract, until all is incorporated.
Beat in the egg, the vinegar and the infused whipping cream. Mix until incorporated.
Take the tart shell out of the freezer and pour the honey mixture into it.
Bake for 45-50 minutes, until the middle of the tart is a little bit jiggly and the edges are golden brown.
Set aside to cool completely and sprinkle with sea salt.