public IQueryable<Restaurant> All()
{
    return from r in _context.Restaurants select new Restaurant(r.Id)
        {
             Name = r.Name
        };
 }

var results = Repository.All().Where(r => r.Name == "BW<3").ToList();

var results = Repository.All().Where(r => r.Id == new Guid("088ec7f4-63e8-4e3a-902f-fc6240df0a4b")).ToList();

The member 'BurningPlate.Models.Restaurant.Id' has no supported translation to SQL.

return from r in _context.Restaurants select new Restaurant()
        {
             Id=r.Id,
             Name = r.Name
        };