This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means serve, so the verb version is to serve or to pour.

Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:

What do you decide to serve your guests? Cookies (く)! But not just any cookies. Cookie smoothies! They're delicious and you won't pour anyone anything else. They must drink your delicious cookie drinks.