Heat oil:

Pour oil into a medium saucepan to a depth of 2 inches. Heat until it reaches 335-350°F (168-177°C).

Mix dough:

In a medium bowl, mix together flour and lemonade using a spatula until a cohesive dough forms with no dry flour. The dough should be sticky yet easy to scoop with a cookie scoop. If it's too wet, incorporate a bit more flour; if too dry, add a splash more lemonade.

Fry donuts:

When the oil is hot, use a 1 tbsp cookie scoop to portion the dough. Level the scoop with a spatula and carefully drop the dough balls into the oil. Fry in batches, turning once, until both sides are golden brown. Transfer to a plate lined with paper towels to remove excess oil.

Add glaze:

Once the donuts have cooled enough to handle, apply an optional lemon glaze or any desired topping.