Green Soup with Ginger recipes

Name: Green Soup with Ginger recipes
Ingredients: 1 large yellow onion (250g); 2 tablespoons (30 ml.) olive oil; 1 1/2 teaspoons sea salt, plus more to taste; 1 large sweet potato (12 ounces; 350 g); 1 large leek, white and light green parts (5 ounces; 140 g); 1 bunch spinach (8 ounces; 225 g); 1 large bunch green chard (12 ounces; 350 g); 3 tablespoons (30 g) chopped fresh ginger, plus more to taste; 2 cups (500 ml) good-tasting vegetable broth; 2-4 teaspoons fresh lemon juice; ground black pepper