Spaghetti with Asparagus, Wilted Greens, and Avocado - One Green Planet

Name: Spaghetti with Asparagus, Wilted Greens, and Avocado - One Green Planet
Cuisine: European, Italian, Mediterranean
Ingredients: 2 tablespoons extra-virgin olive oil; 2 to 3 large red swiss chard leaves (about 5 1/2 oz / 156 g total); 8 ounces (227 g / about half a bunch) asparagus; 8 ounces (227 g) dry spaghetti; 4 large garlic cloves (20 g total), minced; 1/2 cup (118 ml) white wine; zest from half a lemon; zest from half a lime; 1/2 teaspoon plus 1/8 teaspoon salt; 1/2 teaspoon freshly ground black pepper, plus more for garnish; 1/8 to 1/4 teaspoon red pepper flakes; 1 cup (237 ml) vegetable broth; 2 teaspoons lemon juice, plus more to taste as needed; 2 teaspoons lime juice, plus more to taste as needed; 2 ripe seeded, peeled, and diced into cubes, plus more for garnish if desired