15 minutes
30 minutes
4
Step 1
Mix cheese and green onions in medium bowl. Gently mix ground veal, Worcestershire sauce, salt and pepper in large bowl. Divide veal mixture into 4 equal portions. Divide 1 portion in half; form two 1/8-inch-thick patties. Place 1/4 cup cheese mixture atop 1 patty; top with second patty. Seal at edges to enclose cheese mixture. Repeat with remaining 3 portions.
Mix mayonnaise, mustard, lemon peel and sage in small bowl. (Patties and mayonnaise mixture can be made 2 hours ahead. Cover separately and refrigerate.) Preheat oven to 400°F. Place mushrooms on rimmed baking sheet. Combine 4 tablespoons oil and garlic. Brush over both sides of mushrooms. Sprinkle with salt and pepper. Roast mushrooms until tender, turning once, about 20 minutes.
Heat remaining 2 tablespoons oil in heavy large skillet over medium-high heat. Add burgers and cook until cheese melts, about 5 minutes per side.
Spread mayonnaise mixture over buns. Place burgers on bottom halves. Top with mushrooms, then with bun tops. Or omitbuns and top mushrooms with burger and mayonnaise mixture.
Bon Appetit