Pea Mint Soup - The Blender Girl

Ingredients

• 2 tablespoons extra-virgin olive oil
• 2 cups (300g) diced yellow onion
• 1 cup (120g) cauliflower florets
• 5 cups (1.24l) vegetable broth
• 2 cups firmly packed chopped iceberg lettuce
• 6 cups (810g) frozen green peas, thawed
• 1 teaspoon Celtic sea salt, plus more to taste
• 3/4 cup (21g) firmly packed fresh mint leaves
• Freshly ground black pepper
• 2 teaspoons fresh lemon juice, plus more to taste
• Vegan sour cream, to serve (optional)
• Finely chopped flat-leaf parsley, to serve (optional)