Learn French: Je propose un restaurant italien. - I suggest an Italian restaurant.

In French, the verb proposer is the most common way to say "to suggest" an idea or plan. While it looks like the English word "propose" (and can sometimes mean that), it is used much more casually in French to offer up everyday ideas.

Why does italien come after restaurant?

In French, most adjectives are placed after the noun they describe. Adjectives that describe nationality, like italien (Italian) or français (French), always go after the noun.

When would I use italienne instead of italien?

You use italienne when describing a feminine noun. Because un restaurant is a masculine noun, we use the masculine adjective italien. If you were suggesting an Italian pizzeria (une pizzeria), it would be une pizzeria italienne.

Since this lesson is about on meaning "we", how might someone reply to this using on?

While this sentence uses je (I) to make the suggestion, the reply for "we" will likely use on. Your friends might agree by saying Oui, on adore la cuisine italienne ! (Yes, we love Italian food!) or On y va ! (Let's go!).