Hollow out the pumpkin flesh and use it to make filling.
Tips
usage
Everyday word for the soft inside of a fruit, especially a melon: 西瓜瓤, 南瓜瓤. The 儿 suffix is common in Beijing speech: 馒头瓤儿 is the soft white middle of a steamed bun (vs the crusty skin 皮). Extended figuratively: 豆瓤 for the inside of a soybean dish.
memory
Mnemonic — the radical on the left is 瓜 (melon); the phonetic 襄 on the right gives the sound (xiāng → ráng, regular Mandarin shift). Put them together: 'the inside of a melon' — pulp.
Right 瓜 (Kangxi #97, melon) supplies the meaning: the flesh INSIDE a melon. Pairs with 瓠 (gourd) and 瓢 (ladle made from a halved gourd) in the gourd-and-melon family.
Left 襄 supplies the sound. The Old Chinese reading of 襄 was much closer to ráng than the modern Mandarin reading suggests — the same phonetic gives 嚷 (shout), 壤 (soil), 攘 (snatch), 穰 (abundant grain).