Entity Framework composite key delete with one primary key

Here's some of my database design on my assignments

Customer
--------
CustomerID (PK)

Cake
-------
CakeID (PK)

Cart
-------
CustomerID (PK, FK)
CakeID (PK, FK)

I'd like to make a function clearUserCart(User user) in my Cart Repository class but I have no idea how to make function to delete all rows with specified user.

EDIT : I have figured out how to do it, just use getCartOfUser(User user) which returns List<Cart>. Then do foreach loop to remove. In SQL, it could be achieved just by one line DELETE FROM Cart WHERE CustomerID = <the cust id>, is there an equivalent one line statement in entity framework?