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Preheat oven to 350°. Toss oats, walnuts, sunflower seeds, pumpkin seeds, sesame seeds, salt, and za'atar with oil and agave syrup in a medium bowl. Transfer mixture to a parchment lined baking sheet and bake, stirring once, until golden, about 25–30 minutes. Let cool.
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In a large pot over medium heat add the olive oil. When oil is hot, add onion. Cook until the onion is soft and translucent, about 5-7 minutes. Add garlic and cook for another minute.
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Add the potato, Romanesco and broth and increase heat to high. Bring to a boil, then lower heat to a simmer and cook for about 20 minutes or until vegetables are soft. Remove from heat and add parsley. Transfer contents to a blender in batches or use an immersion blender to puree until smooth. Stir in lemon juice and season to taste with salt and pepper.
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Ladle into bowls and garnish with za'atar granola just before serving.