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Portobello Burger Stack with Grilled Onions, Chimichurri & Asparagus

Name: Portobello Burger Stack with Grilled Onions, Chimichurri & Asparagus
Cook time: 35 min
Total time: 35 min
Yield: 2 servings
Ingredients: 1 small bunch asparagus; ½ small bunch cilantro; 1 clove garlic; ½ small bunch Italian (flat-leaf) parsley; ¾ lb lean ground beef; 2 caps portobello mushrooms; ½ medium red onion; ½ tomato; 0.31 tsp black pepper; ⅛ tsp crushed red pepper; 8 tsp extra virgin olive oil; ⅜ tsp oregano, dried; ⅛ tsp paprika; 1 tbsp red wine vinegar; ¾ tsp salt