Heat the 2 cups whole milk in a microwave safe bowl or measuring cup for 60-90 seconds or until it comes to a temperature between 105°-115°F. If hotter, allow to cool before adding, it will kill the yeast.
In a large mixing bowl or a stand mixer fitted with the bread hook, combine the 1 packet rapid rise dry yeast and 1/3 cup sugar, giving a quick stir to combine. Add the warm milk and allow to bloom for 10 minutes. The mixture should be frothy and fragrant. If the dough does NOT rise, stop right here- it means that the yeast was no active, the water was too hot and killed it or the water was not hot enough to bloom. The rolls will not turn out if the yeast does not activate.
Preheat the oven to 400°F. Melt the 1/2 cup unsalted butter in a microwave safe dish. Melt it and then baste about 2 tablespoons of it all over a 9x13 baking dish or large cast iron pan. Set aside the pan and the butter.
After the yeast has bloomed, stir in the the remaining melted unsalted butter, 2 eggs, and 1 teaspoon coarse sea salt to the yeast mixture. Add the 6 cups flour, 1 cup at a time, mixing between each addition until just combined. Do not overmix.
Knead until the bread dough comes together and slaps against the side of the bowl.
Turn the dough onto a lightly floured cutting board or work surface. Divide the dough into 12 equally sized balls and place them into the prepared 9x13 baking dish or large cast iron pan. They might not touch now, but will come close when they rise. Cover and allow to rise for 10-15 minutes. Meanwhile, make the coconut sauce (listed below).
When you are ready to bake the rolls, pour the coconut sauce over the tops of the rolls. It will pool in the bottom, this is normal.
Bake the rolls, uncovered, for 20-25 minutes, or until the tops are golden brown browned. Sprinkle gently with flaky sea salt, if desired.
Coconut Sauce:
In a small saucepan, before you add heat, stir together the 1/2 cup sugar and 1 teaspoon cornstarch . Then stir in the 13.5 ounce canned unsweetened coconut milk and 1/4 teaspoon coarse sea salt over low heat until the sugar has dissolved.
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