McDonald's has given the Quarter Pounder a makeover

McDonald's has remade the famous Quarter Pounder.

The chain recently started toasting its buns longer and increased the size of its patties from 4 ounces when raw to 4.25 ounces. The 4-ounce patties shrink to 2.8 ounces after cooking.

McDonald's changed how its patties are seared to lock in more flavor, the company announced in a tweet Monday.

McDonald's is making major changes to its menu and business following seven straight quarters of same-store sales declines in the US, where the chain is battling a pervasive public perception that its food is processed and unhealthy.

The company has also been hurt by a series of food-safety scandals in Asia, which contributed to a 15% loss in net income last year.

Meanwhile, the company's relationship with franchisees, who operate 81% of its restaurants globally, is at an all-time low. Employees have also been striking for higher pay and better working conditions.