Preheat oven to 220°C (428°F).
Peel and dice sweet potatoes. Chop cilantro.
Add sweet potatoes and chopped cilantro to a mixing bowl. Add one tablespoon sunflower oil. Add salt and black pepper to taste. Toss to combine.
Add to a baking sheet with parchment paper and bake for 20-25 minutes, until sweet potatoes are soft and golden brown.
Peel and dice mango.
Add diced mango and black beans to a mixing bowl. Add salt and black pepper to taste. Toss to combine.
Plate salad by adding roasted sweet potatoes to two serving bowls and topping with mango and black beans mixture.
Garnish with fresh cilantro if desired.
Serve with salsa on the side. (optional)