Salad with sweet potato fries, toasted corn, grilled spring onions and red wine Italian herb vinaigr

Ingredients

• 3 sweet potato (cut into wedges)
• 1.5 tablespoons extra virgin olive oil
• 1 teaspoon salt
• 1 teaspoon garlic powder
• 1/2 tablespoon curry powder
• 1/4 tablespoon garam masala spice blend
• 1/2 tablespoon sumac powder
• 1/2 tablespoon zaatar spice blend
• 4 ounces lettuce leaves (roughly torn or chopped)
• 2 corn on cob (large)
• 1 small bunch spring onion (bottoms and tops trimmed)
• 1/2 cup red wine vinegar
• 1/4 cup extra virgin olive oil
• 1.5 teaspoons sugar
• 2 teaspoons Italian seasoning
• 1 teaspoon black pepper
• 2 tablespoons fresh herbs, dill, basil ((optional))