01 - Pulse flour, powdered sugar, and salt in a food processor. Add cold cubed butter and pulse until mixture resembles coarse crumbs. Add egg yolk and 1 tablespoon cold water, pulsing until dough begins to come together. Add additional water only if necessary for dough to form.
02 - Gather dough into a ball, flatten into a disk, wrap in plastic, and refrigerate for 30 minutes. Preheat oven to 350°F. Roll out chilled dough and press into six 4-inch tart pans. Prick bases thoroughly with a fork.
03 - Line each tart shell with parchment paper and fill with pie weights. Bake for 12 minutes. Remove weights and parchment, then continue baking 8–10 minutes until golden brown. Cool completely in pans.
04 - Combine milk, heavy cream, and honey in a saucepan. Heat over medium heat until just simmering, stirring occasionally to dissolve honey.
05 - Whisk egg yolks, cornstarch, vanilla extract, and salt in a heatproof bowl. Gradually whisk hot milk mixture into yolks. Return mixture to saucepan and cook over medium heat, stirring constantly, until thickened (3–4 minutes). Transfer to bowl, cover with plastic wrap directly on surface, and cool to room temperature.
06 - Whisk whole eggs, egg yolks, sugar, lemon juice, and lemon zest in a saucepan. Cook over medium-low heat, stirring constantly, until mixture thickens and coats the back of a spoon (5–7 minutes). Do not let mixture boil. Remove from heat.
07 - Whisk cubed butter into hot lemon mixture until smooth and emulsified. Pour into a bowl, cover with plastic wrap directly on surface, and refrigerate until set and completely cooled.
08 - Spoon cooled honey custard into baked tart shells, smoothing tops evenly. Layer lemon curd over the custard base. Arrange fresh strawberry slices on top in decorative pattern. Garnish with mint leaves if desired. Refrigerate until ready to serve.