Crush the graham crackers either in a blender, or a food processor. Alternately you can place them in a gallon size bag and use a rolling pin.

Pour crumbs into a medium size bowl then stir in sugar. Add the melted butter and stir until well combined.

Press the crumb mixture into the bottom and up the sides of a 9″ pie pan or spring form pan. Place the pan into the freezer for 10 minutes.

For the Filling

Using an electric mixer set at medium-high speed, beat the room temperature cream cheese in a large bowl until smooth. Or add the cream cheese to the bowl of a stand mixer and beat until smooth. Beat in the condensed milk a little at a time. Be sure to scrap the sides  and the bottom of the bowl with a rubber spatula. Then add the lemon juice and vanilla and mix well.

Pour the cheeesecake filling into the crust; smooth the top with an off-spatula. Then make the berry pattern using the raspberry and blueberry sauce.

For the berry sauces:

In a small saucepan over medium high heat, stir together raspberries, 1 tablespoon sugar, 1 tablespoon water, juice of 1/2 the lemon, and 1/2 teaspoon cornstarch.

In another small saucepan over medium heat, stir together the blueberries, 1 tablespoon granulated sugar, 1 tablespoon water, juice of  1/2 of the lemon, and the other 1/2 teaspoon of cornstarch.

Simmer both pan of  berries until berries have broken down and sauce has thickened, stirring occasionally with a spoon. This should take about 10 minutes.

Cool the berries completely, then pour each sauce separately through a fine mesh sieve into separate bowls. Let the sauces cool completely.

Pour each sauce into its own sandwich bag. Snip a little off one of the corners of each bag. Working with alternating bags, pipe circles about 1 inches apart over the cheesecake starting in the center and working toward the crust. Then drag a wood skewer from the center of pie outward to the crust so that the berry sauces are pulled to create a nice pattern design. Or if you prefer, squiggle the skewer around to make a pattern of your choice.