Shortcrust: Combine the flour, almond, sugar, and salt. Mix in the butter and egg yolk until crumbly. If the dough doesn't come together, add 1 Tbsp chilled water at a time until it just holds. Chill for 15 min, or until firm.
Preheat oven to 350ºF and have a 9" tart pan ready.
Remove shortcrust dough from fridge and roll out to fit the tart pan. Use your fingers to push the dough into the fluted edges of the tart pan. Chill in fridge until ready to use.
Frangipane: To make the filling, whisk all the filling ingredients except the berries.
Remove shortcrust from the fridge and fill with the frangipane, using a spatula to smooth out the frangipane. Top with berries. Bake for 40 minutes, or until crust becomes golden and frangipane is set.