Can there be no grapefruit skin in citron tea?

The practice is as follows:

Ingredients: grapefruit 500g? Accessories: 200 grams of rock sugar and 50 grams of water.

Step 1: Prepare a grapefruit.

Step 2: Peel the grapefruit.

Step 3: Remove the white part of the pulp and take solid pulp.

Step 4: add rock sugar and a small amount of grapefruit pulp to the pot and fry first.

Step 5: Add 50g of clean water.

Step 6: Boil the water for 10 minute, and then add the pulp.

Step 7: Simmer for 40 minutes.

Step 8: the finished product is out of the pot, just cooked and slightly dark in color.