Roll out pastry to fit a 9-in nonstick tart pan and gently shape into pan. Bake crust at 400F 15-20 minutes until lightly golden. Remove from oven and set aside.
In a medium bowl, whisk eggs, lemon juice, zest, sugar, flour, and vanilla extract until smooth. Pour filling into pre-baked tart pan. Bake tart at 350F 20-25 minutes or until filling is firm to the touch. Cool tart completely on a wire cooling rack.
Make the berry sauce: In a medium saucepan, bring all sauce ingredients to a boil. Reduce heat to medium and let sauce simmer until just slightly thickened. Keep sauce warm until ready to serve.
When ready to serve, slice cooled tart into wedges and serve with warm berry sauce and whipped cream if desired. Enjoy!