If you want a theme that works really well for a restaurant + eCommerce combination, you'll want features like:

• Menu display layouts (daily menu / categories, pricing, images)
• Table reservation or booking features
• Online ordering / food delivery support (WooCommerce extensions or built-in)
• Gallery / image heavy support (dishes look good)
• Contact/location, hours, map, possibly events or specials
• Mobile-friendly / fast loading (people often order from mobile)
• Customisation ease (colors, fonts, layout)
• Strong WooCom

merce integration (if selling items, gift cards, merch, meals)