01 - Line a 12-cup muffin tin with paper liners or grease silicone molds lightly.
02 - Combine graham cracker crumbs, granulated sugar, and melted butter in a mixing bowl until evenly moistened. Press approximately 1 tablespoon of the mixture firmly into the bottom of each liner. Refrigerate while preparing the filling.
03 - Beat the softened cream cheese in a large bowl until completely smooth. Add powdered sugar, vanilla extract, lemon zest, and ground lavender, then mix until fully incorporated and no lumps remain.
04 - Whip the heavy cream in a separate chilled bowl to stiff peaks. Gently fold the whipped cream into the cream cheese mixture in two additions, maintaining as much air as possible for a light, fluffy texture.
05 - Spoon or pipe the filling evenly over the chilled crusts, filling each liner nearly to the top. Smooth the surfaces with a small spatula.
06 - Cover the muffin tin tightly and refrigerate for at least 4 hours, or until the filling is firm and set throughout.
07 - Combine fresh blackberries, granulated sugar, and lemon juice in a small saucepan. Cook over medium heat, stirring frequently and gently mashing the berries, until the mixture thickens into a glossy syrup, about 5 minutes. Remove from heat and let cool completely.
08 - Spoon the cooled blackberry sauce over each mini cheesecake. Garnish with a sprig of fresh lavender or a whole blackberry if desired. Serve immediately.