Dine on
Definition 1 of 1
Pro Tip 1/3Meal Specific
The phrase 'dine on' is often used to specify what food was eaten during a meal. 
The couple dined on lobster and champagne for their anniversary.
Pro Tip 2/3Not for Snacks
'Dine on' implies a full meal, not just a snack or a light bite. 
After the meeting, they dined on a hearty lunch.
Pro Tip 3/3Slightly Formal
'Dine on' is more formal than 'eat', and can add a touch of elegance to a sentence. 
Guests at the gala dined on fine gourmet dishes.