Preheat the oven to 350˚F (176˚C).
Place the oatcakes into a plastic food bag, seal it and crush them into coarse crumbs with a rolling pin. Or process them into crumbs in a food processor.
Transfer the oatcake crumbs to a mixing bowl then add the melted butter and granulated sugar. Mix until evenly combined then transfer the crumbs to a 9-inch tart pan with a removable bottom.
Press the mixture into the tart pan sides and bottom to form the crust.
Bake the crust on a half sheet pan for easy maneuverability at 350˚F (176˚C) for ten minutes. Remove the crust from the oven and transfer it, still on the sheet pan, to a cooling rack for now. Raise the oven temperature to 375˚F (190˚C).
Whisk together the ricotta, cream cheese, eggs, honey, kosher salt, lemon zest, lemon juice, and vanilla extract in a mixing bowl, or combine them together in a food processor.
Pour the filling into the pre-baked crust, still on the half sheet pan, and return it to the oven to bake for 30-35 minutes at 375˚F (190˚C) until the edges of the filling puff up and the center is still jiggly.
Remove the ricotta pie from the oven and allow it to cool to room temperature. Then refrigerate it for at least 2 hours or overnight to allow the ricotta pie to set and firm up.
About 30 minutes before you are ready to serve the ricotta pie, chill a mixing bowl and whisk or whisk attachment(s) for a stand mixer/hand mixer in the freezer or refrigerator. After they are cold whip the heavy cream, granulated sugar, and vanilla extract to soft peaks.
Remove the outer ring of the tart pan and leave the tart on the base. Spoon the whipped cream onto the center of the ricotta pie and garnish with fresh berries, mint leaves, edible flowers, a drizzle of honey and lemon zest right before serving.