Grape Galette with Almond Cream

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For the crust: 

1 3/4 cups all-purpose flour, plus more for dusting

5 tablespoons sugar

1 teaspoon salt

10 tablespoons cold unsalted butter, cut into small pieces

1 large egg yolk, for brushing

For the filling:

1/2 cup plus 2 tablespoons sliced almonds

1/4 cup plus 2 tablespoons sugar

1 large egg yolk

2 tablespoons unsalted butter, at room temperature

1 1/2 teaspoons pure vanilla extract

1 teaspoon finely grated lemon zest

1 pound seedless grapes (red, purple and/or green; about 2 cups)