Into the bowl of your stand mixer, add the sugar, warm water and yeast, whisk to combine. Let sit for 10 minutes so the yeast can bloom.
Meahwhile, combine the flour and salt. Set aside.
Once the yeast is foamy, add in the two eggs, mixing after each addition. Then add the melts (and cooled)butter. Mix until combined.
Gradually add in the flour mixture, mixing until just combined.
In a large and lightly oiled bowl, transfer the dough. Cover with a clean kitchen towel and place in a warm spot to rise for 1 hour.
Once risen, turn the dough out onto a lightly floured surface. Shape into a 12-inch rope. Cut in half and each half into 6 equal pieces.
Roll the dough into balls and place onto a lightly sprayed 1/4 sheet pan (roughly 9x13).
Cover again with a kitchen towel and place in a warm spot to rise for 30 minutes.
Preheat your oven to 350℉ (or 180℃).
In a small sauce pan, melt 1/4 cup of butter. Remove the leaves from a few stems of rosemary and finely mince.
Once the rolls have risen for the second time, brush with butter and sprinkle with minced fresh rosemary and flaked sea salt.
Bake on the middle of your preheated oven for 15 to 18 minutes, rotate the pan halfway to ensure even browning.