Into a medium bowl sift together the flour, sugar and salt. Stir in the oil and mix with a fork or pastry blender until the size of peas. Stir in the milk and mix until begins to form a dough. Stir in enough water to form a smooth ball. Flatten into a disk and wrap in plastic wrap. Allow to rest refrigerated for 20 to 45 minutes.
Preheat the oven to 375°F.
In a large bowl toss the berries and nectarines with 1/4 cup of the sugar and the lemon zest. Let sit 3 minutes, then taste to determine if more sugar is needed, adding more as needed. Add the cornstarch and mix well.
On a lightly floured surface, roll the dough into a large circle, about 10-inches across. Tranfer to a baking sheet.
Spread the fruit filling into the center of the dough, leaving a 2-inch border around the edge. Fold the edges over the filling, overlapping the dough into folds.
With a pastry brush, brush the cream onto the dough border and sprinkle the remaining 2 teaspoons of sugar on top.
Bake until the dough is golden brown and the fruit is bubby, about 35 to 40 minutes. Remove from the oven and cool on the baking sheet for at least 10 minutes before serving.
Yield: 6 servings