Is it a wood-fired oven?
FOR-no — two syllables, stress on first. LE-gna — 'gn' is nasal palatal, like 'ny'. Two syllables.
Before ordering, when you want to confirm the type of oven. Wood-fired ovens produce a distinct flavour and char that many consider superior.
'Forno a legna' = wood-fired oven. 'Forno elettrico' = electric oven. In Neapolitan tradition, only a wood-fired oven reaches the correct 485°C temperature. Gas ovens are accepted in the Neapolitan pizza regulations as a second choice.
La pizza è cotta nel forno a legna?
Is the pizza cooked in a wood-fired oven?
More complete question — confirms the cooking method explicitly
Che tipo di forno usate?
What type of oven do you use?
Open question — the pizzeria may explain their equipment and philosophy
Avete il marchio AVPN?
Do you have the AVPN certification?
The Neapolitan pizza association certification — rare but meaningful
The Neapolitan pizza oven is treated with near-religious reverence. Many famous pizzerias have ovens that are never allowed to go out — the fire burns continuously for decades. The pizzaiolo who tends the oven is a skilled craftsperson with years of training.