Grilled Portobello Sandwich with Walla Walla Onion Relish

Grilled Portobello Sandwich with Walla Walla Onion Relish

YIELD: 24 servings

Walla Walla Onion Relish:
4 lbs. Walla Walla or other sweet onions, sliced ¼" thick
¼ cup olive oil, divided
1 qt. seeded, diced tomato
½ cup (3 oz.) shredded

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