1 Bring A 1 Or 2 Quart Saucepan, Half Filled With Water, To A Boil. Add The Chopped Chard Leaves. Cook Until Tender, About 3-5 Minutes. While The Chard Is Cooking, Prepare A Bowl With Ice Water For An Ice Bath. When The Chard Is Cooked, Strain Through A Fine Mesh Strainer And Put Into The Ice Bath To Stop The Cooking. Drain And Set Aside. 2 Using Mortar And Pestle, Grind The Garlic And Salt Into A Paste. In A Medium-Sized Bowl, Stir In The Yogurt, Chard, Garlic, Olive Oil, Lemon Juice, And Cayenne Pepper. Set Aside. 3 Cut The Pita Bread Into Triangles And Layout In One Layer In A Broiling Pan (Use A Sturdy Broiling Pan, Not A Cookie Sheet Or Your Cookie Sheet Will Warp). Drizzle Olive Oil On One Side Of The Pita Wedges. Use A Pastry Brush To Spread The Olive Oil More Evenly. Place In A Broiler. Broil For 5 Minutes Or Until The Pita Bread Starts To Toast. Remove And Let Cool For A Minute. Serve The Tzatziki With The Pita Wedges.