Every Sunday from July through September, Morton's guests will have a chance to indulge in the '$19.78 Morton’s & Make-A-Wish Prime Sirloin Burger,' with five dollars of each hamburger/fries entrée going to the Make-A-Wish Foundation.

 This isn't just any hamburger -- it's the burger that started it all at Morton's. When Morton's co-founders Klaus Fritsch and Arnie Morton first worked together at the Playboy Club, Fritsch made his signature hamburger and sent it out for Arnie Morton to taste. Morton proclaimed it the best hamburger he'd ever tasted. From that day, they started the business partnership that has become Morton's The Steakhouse. Now in its 30th year, Morton’s has 79 world-wide restaurants and will be opening its 80th location this June in Coral Gables, Fla.

• Available on Sundays only during July, August and September at the two Houston locations;
• Morton’s the Steakhouse downtown at 1001 McKinney at Fannin
• Morton’s the Steakhouse Centre of Post Oak at 5000 Westheimer

• Offer will include Morton’s hamburger and French Fries

 $5.00 of each hamburger/fries entree sold will be donated to the Make-A-Wish Foundation