1. In bowl, beat egg and water with fork; mix in bread crumbs, onion, mustard, salt, Worcestershire and pepper.

2. Add Oil.

3. Mix in beef.

4. Shape into four 1/2-inch (1 cm) thick patties. (Make-ahead: Cover and refrigerate for up to 6 hours. Or layer between waxed paper in airtight container and freeze for up to 1 month; thaw in refrigerator).

5. Place patties on greased grill over medium-high heat; close lid and cook, turning patties once, for about 10 minutes or

TIP: Adding a bit of water to the mixture ensures that the patties stay deliciously melty moist as they sizzle to well done.