Sprinkle cumin over diced sweet potato and drizzle over olive oil. Bake In a 220℃/428℉ oven until tender, approximately 20-25 minutes. Turn halfway. Allow to cool.
Spread prosciutto in a single layer on baking paper and roast at the same time until it changes colour and becomes a little crispy. About 10 minutes. Watch so it doesn't burn. Allow to cool.
Whisk dressing together and drizzle over leaves in salad bowl. Arrange sweet potato and crumbled prosciutto artfully over leaves.
***A note on the dressing; it's usually 2:1 when it comes to olive oil (and I like a light extra virgin oil oil) vs lemon juice, but you can add additional lemon to taste, or take it back a notch too.