In a bowl, combine the lukewarm milk and water. Sprinkle in the instant yeast and let it activate for about five minutes until frothy.

In a separate bowl, mix 1/4 cup granulated sugar, 3 3/4 cup all-purpose flour, and 1 tsp salt. Add the melted butter and the yeast mixture to the dry ingredients, stirring until a soft dough forms.

Sprinkle some flour on your countertop and knead the dough for about 5-7 minutes until smooth and elastic.

Form the dough into a ball, place it in a greased bowl, cover with a towel, and let it rise in a warm place for approximately one hour or until it doubles in size.

While the dough rises, prepare the filling by combining cocoa powder, chocolate chips, and graham cracker crumbs in a bowl.

Mix in the heavy whipping cream to create a spreadable filling.

Once the dough has risen, punch it down and roll it out into a rectangle about 1/2-inch thick.

Spread the filling evenly over the dough. Starting from one long side, roll the dough tightly into a log and slice into equal portions, about 1 to 1.5 inches wide.

Preheat your oven to 350°F (175°C). Arrange the rolls in a greased baking dish, leaving space between each piece for expansion.

Cover with a cloth and let them rise for another 30 minutes. Bake in the preheated oven for 25-30 minutes until golden brown.

While the rolls are baking, prepare the meringue topping by beating the egg whites in a clean bowl until foamy.

Gradually add 1/2 cup granulated sugar, cream of tartar, and 1/8 tsp salt, beating until stiff peaks form. Fold in 1/2 tsp vanilla extract.

Once baked, remove the rolls from the oven and immediately spread the meringue over the top.

Return them to the oven for an additional 5-10 minutes until the meringue turns lightly golden.