How to get the point across

5-yr-old: “Dad, I want that… mmm… long thing… what is it called?”
Dad (distracted): “Which? What?”

“Tell me the names of some fruits.”
“A ‘long’ fruit? Let me see… ”

“No, not long. Just name some fruits.”
“Well… apple, orange, banana,…”

“Okay. It’s not a fruit. Tell me the names of vegetables.”
“Long ones?”

“No. All vegetables.”
“Tomato. Brinjal. Onion. What else is there? Potato?”

“Ah! Yes! Potato. What is that long thing made from potatoes?”
“French fries?”

“YES! French fries. I want French fries.”