Pour the oil into a large heavy-bottomed saucepot fitted with a deep-frying thermometer. Heat the oil over medium heat until the thermometer registers 325 degrees F. Line a baking sheet with paper towels and top with a wire cooling rack.
Separate the biscuits, then cut each biscuit in half, creating 16 half-moons. Use your fingers to separate the dough of one half-moon into 3 layers. With the rounded edge up, gently wrap one layer around a fingertip to create the center of the rose. Slide it off and then wrap a second layer around the center, trying to match the shape of a flower. Wrap the third layer around the blossom, using a fingertip to lightly press the rounded edges outward like petals. Give the base of the flower a light pinch to secure the layers together. If the dough has dried out slightly, dampen it lightly with water and then pinch it. Repeat this process with the remaining biscuit halves.
Carefully lower the roses a few at a time into the hot oil. Be sure not to crowd the oil or the temperature will drop. Control the heat to maintain 325 degrees F. Fry until golden brown all over, about 2 minutes per side. Drain on the prepared cooling rack. Continue with the remaining roses.
Let the doughnuts cool completely and then drizzle with Floral Doughnut Glaze. Immediately sprinkle with dried rose petals or lavender, as desired. Allow the glaze to set for 1 hour.
For the rose glaze: Whisk together the confectioners' sugar, rose jelly and pomegranate juice in a small bowl until incorporated.
For the lavender glaze: Whisk together the confectioners' sugar, milk and lavender honey in a small bowl until incorporated. Add 1 to 2 drops of lavender oil, depending on the desired vor intensity.
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