In a food processor place the flour, sugar and salt and process until combined. You can also do this by mixing with a fork or a dough blending tool.
Add in the butter and vegetable shortening and process until you get sand-like consistency (which you can also do using a fork, a dough blending tool or using the tips of your fingers).
After add in the cold water and the white vinegar and process (or combine with your hands) until a soft dough forms. Wrap this dough in plastic kitchen wrap and let it rest in the refrigerator for 30 min.
For the filling:
Place all the strawberries, peaches, honey, cinnamon and vanilla extract in a bowl, and mix until all the fruit slices are coated with the rest of the ingredients, and set aside.
To assemble:
Preheat the oven to 375°F (180°C).
Take the dough out of the fridge and roll out on a clean floured surface to make a circle of about 15 inches (40 cm) in diameter.
Place the rolled oats in the middle of the dough circle. Then put the fruit on top of that, leaving the edge of the dough free.
Fold the edges of the circle inwards.
Beat the egg and brush this beaten egg on the dough, and sprinkle both the sugar and the almond slices on top and bake at 375°F (180°C) for 25 min aprox.