Make the Dough:

1. Place milk in a microwave safe measuring cup. Heat for 45 seconds in the microwave, until it’s about 120°F, think hot bathwater. (The time you heat it will need to be adjusted depending on your microwave. You can use a candy or a meat thermometer to test the temperature.) Add yeast and 1/2 teaspoon sugar and stir. Let it sit for a few minutes until frothy.
2. Place sugar, butter, salt, lemon juice, lemon zest, and egg in the bowl of a stand mixer fitted with the paddle attachment. Mix until the butter is distributed throughout the liquids, although it may be chunky. Pour in the milk/yeast mixture and stir for a few seconds.
3. Add 3 cups flour and stir with the paddle attachment just until the mixture starts to stick to the paddle. Then replace the paddle with the dough hook. Continue mixing on low speed until the dough forms a ball in the center of the bowl. The dough will be slightly sticky and elastic. There will be minimal transfer to your finger if you poke it. If it’s still very wet, add up to 1/4 cup more flour, 1 tablespoon at a time.
4. Spray a large bowl with cooking spray and place the dough in it. Spray the top of the dough ball with cooking spray (lightly) and cover the bowl with plastic wrap. Let sit for 2-4 hours until it doubles in size. Note on rising: if your house is warm, it should rise no problem. If it’s cold in your house, it may take longer for the dough to rise.

Prepare your Rolls:

1. Stir together butter, sugar, lemon zest, salt and flour until it forms a paste.
2. Once the dough is risen, roll it out on a lightly floured surface into a large rectangle, about 10” by 14”. Spread the filling as evenly as possible over the rectangle, making sure to reach to the sides so the outer rolls have enough filling. Sprinkle with blueberries. I used 1 cup of mini (or “wild”) blueberries that were defrosted and drained. If you’re using regular sized berries, you might want to use more of them.
3. Roll the dough up tightly from the long end. Slice it into 12 equal rounds. Place the rolls into a 9x13” pan that has been sprayed with cooking spray.
4. Cover the rolls with plastic wrap and refrigerate overnight. (Or, if you want to make them  the same day, cover with plastic wrap and let them sit for 1 hour until they’ve puffed up a little, then continue as directed below.)
5. When ready to bake, preheat oven to 350°F. Remove the rolls from the refrigerator and let them warm up to room temperature while the oven is preheating. Remove the plastic wrap and bake for 23-28 minutes, or until they are golden brown. (Mine took 24, be careful not to over bake. The bottoms will turn golden before the tops do.) Note: the blueberries will drain to the bottom of the pan overnight. That’s not a problem.

Make the frosting:

1. Whisk the melted butter and softened cream cheese until mostly smooth. If your cream cheese is too stiff, you can use a hand mixer. Whisk/beat in powdered sugar and 3 teaspoons lemon juice, adding more as desired for thickness. Pour over warm rolls and serve.

Notes:

Note about blueberries: I prefer to use mini blueberries in my baking, as it's what my family prefers. They are often labeled "wild" and they are smaller than normal berries. You can often find them at Trader Joe's or Whole Foods. You can use regular sized berries, fresh or frozen, but make sure frozen berries are thawed and drained. Use 1-2 cups, deepening on how many berries you want in your rolls.

The recipe is written for 12 rolls, but you can make 9 large ones instead. Bake in a 9x9" pan or a 9" round pie plate and bake for a few minutes longer.