Adjust oven rack to middle position and reduce oven heat to 350ºF.
Measure out 1 tablespoon lemon juice and set aside.
Whisk remaining 7 tablespoons lemon juice, ¼ cup lemon zest, 1 egg, 5 yolks, ⅓ cup honey, and pinch salt in medium saucepan until smooth. Cook over medium-low heat, stirring constantly with rubber spatula, until mixture thickens slightly and registers 165ºF, about 5 minutes.
Off heat, whisk in 4 tablespoons chilled butter until melted. Strain lemon curd through fine-mesh strainer into bowl, then gently stir in 2 tablespoons cream with rubber spatula.
Pour warm lemon curd into cooled tart crust. Set tart on baking sheet and bake until filling is shiny and opaque and center jiggles slightly when shaken, 10–12 minutes, rotating pan halfway through baking. Transfer tart with baking sheet to wire rack and let cool slightly.
Meanwhile, process 10 ounces (2 cups) raspberries in a food processor until smooth, about 2 minutes. Strain purée through clean fine-mesh strainer into medium saucepan, pressing on solids to extract as much liquid as possible; discard solids.
Whisk in remaining ⅓ cup honey and ⅛ teaspoon salt. Whisk together 3 tablespoons cornstarch with reserved 1 tablespoon lemon juice and 2 tablespoons water in a small bowl, then whisk into strained raspberry mixture. Bring to simmer over medium-low heat, stirring constantly, and cook until thickened and registers 170ºF, about 5 minutes.
Allow raspberry mixture to cool in pan to 130ºF, about 5 minutes; whisking occasionally.
Pour slightly cooled raspberry mixture evenly over cooled lemon filling. Spread into an even layer, then refrigerate until raspberry layer is set and shiny, about 2 hours.
To serve, remove outer ring of tart pan, slide thin metal spatula between tart and tart pan bottom, and carefully slide tart onto serving platter or cutting board. Cut into wedges and enjoy.