红薯
hóng shǔ · HSK 7
sweet potato
🍠 红薯 = 红 red + 薯 tuber; the red-skinned tuber is the sweet potato
红 hóng means red and 薯 shǔ means tuber or yam-type root. Together they name the reddish-skinned root we call sweet potato. The 🍠 glyph is literally a roasted sweet potato.
红 — silk radical 糹/纟 + work 工 (phonetic)
红 is a semantic-phonetic compound. The silk radical 糹 (simplified 纟) signals the meaning, since the character originally referred to a kind of pink or light-red dyed silk. The right side 工 supplies the sound. Over time the meaning broadened from the dye color to 'red' in general.