Melt butter over medium heat and cook until the butter turns a deep golden brown. (I found that I had to cook my butter at a bit higher heat than medium, but I have an electric stove.) Remove from heat and set aside to cool (Be careful not to burn the butter. You need to watch it carefully as it can go from browned butter to burned butter in a second. You want the butter to have a nice nutty flavor)

Using your food processor, process the graham crackers until they are finely ground. Put the ground crackers into a bowl and mix them with the cooled brown butter. Set aside until the mixture is totally cool.

Prepare a springform pan by spraying it with cooking spray or applying butter to the bottom and sides of the pan. Alternatively, you can use a glass pie plate.

Put cream in a medium bowl and beat at medium speed while slowly drizzling the condensed milk into the bowl. Turn the speed of your beaters up to a higher speed and beat until stiff peaks form. Chill the beaten mixture until you are ready to assemble the Mango Royale.

Prepare mangoes. Scoop out the flesh from the mangoes and puree it in a processor until it is smooth. You will need about two cups of mango puree. Add the lime juice to your puree if you are using it.

Assemble you dessert. Sprinkle about 2/3 of your graham cracker crumbs on to the bottom of your pan or pie plate. Use your hands to press the crumbs down to create an even layer on the bottom of the pan. Also, press some of the crumbs up the sides of the pan.

Spoon half of the whipped cream mixture over the layer of crumbs. Use an offset spatula to carefully spread the cream mixture over the crumbs trying not to disturb the crumbs. Spoon half of the mango puree on top of the cream layer and spread evenly.

Sprinkle most of the rest of the crumbs over the dessert and repeat the layers--cream mixture first and then mango puree layer.

Sprinkle remaining crumbs over the top of the dessert. (I didn't have a lot of crumbs at this point. I think the dessert would present just fine with no crumbs on top.) Wrap dessert in plastic wrap and put it in your freezer. Freeze until firm. This will take about 8 hours or overnight. (This dessert can be made ahead of time and frozen for up to two weeks.)

When you are ready to serve the Mango Royale, defrost the dessert on your counter for 45 minutes to an hour. Cut with a knife that you have dipped into hot water. Garnish with fresh raspberries. You want to serve the Mango Royale pretty cold. As it approaches room temperature, the dessert loses some of its shape.