Add the warm water to a small bowl, then dissolve the brown sugar in the water
Next add the dry active yeast and mix together well, then cover and set aside in a cool warm place to allow the yeast to activate
In another bowl, combine the butter and milk and set aside
When the yeast has activated and is nice and frothy combine the yeast and the butter and milk mixture. You can do this in your stand mixer or in a large mixing bowl
Then add the lemon zest, lemon extract and vanilla extract and mix together
Start to make the dough by adding 1/2 cup of flour to the liquid mixture and using a whisk or the whisk attachment of your mixer mix together to form a smooth pancake like batter
Continue to add small amounts of flour until the batter becomes too thick to whisk
If using your stand mixer switch to the dough hook and add the remaining flour
Then mix on low speed until a smooth dough forms
If mixing with your hands continue to add the flour 1/2 a cup at a time until all of the flour is mixed in to form a smooth dough
Turn the dough unto a floured surface and knead it into a smooth tight ball
Place the dough ball into a greased bowl, cover with a kitchen towel and let proof until it doubles in size
Once the dough has doubled in size, punch down and knead the dough again. At this point you can allow the dough to proof again or you can cut the dough into 8 pieces and begin to work on your tennis rolls
Knead each piece of tennis roll dough into tight smooth balls
Place the dough balls on a greased baking sheet and cover with a kitchen towel
Set dough balls aside and let them proof for 30 to 45 minutes until they doubles in size
Preheat your oven to 350 °F
Finally, make an egg wash using an egg white and 2 tablespoons of water
Brush the egg wash over the top of the tennis rolls
Bake tennis rolls for 25 minutes
Remove the tennis rolls from the oven and brush with butter then cover with a kitchen towel and let cool
After the tennis rolls cool down a bit, place them in a large ziplock or bread back to help keep the tennis roll from becoming stiff
Enjoy with a nice slice of extra sharp cheddar cheese