Beef Gyros with Tzatziki Sauce

INGREDIENTS

• 2 lbs. ground beef or ground lamb
• 3/4 cup Hellmann's® or Best Foods® Real Mayonnaise, divided
• 1 envelope Lipton® Recipe Secrets® Onion Soup Mix
• 4 tsp. finely chopped garlic, divided
• 1 tsp. dried oregano leaves
• 1 tsp. dried rosemary leaves, crushed*
• 1 cup 2% Greek Yogurt
• 1 cup finely chopped peeled, seeded cucumber
• 1 Tbsp. finely chopped fresh dill
• 8 pocketless pita breads
• 4 cups finely shredded romaine lettuce
• 2 cups chopped fresh tomatoes
• 1/2 cup thinly sliced red onion
• Chopped fresh mint or parsley leaves (optional)