In a small bowl combine minced garlic, chopped fresh red chilies, soy sauce, sesame oil, and jaggery powder — whisk or stir together until jaggery is fully dissolved and dressing is smooth and well combined.
Taste dressing and adjust — add more soy sauce for saltiness, more chili for heat, or more jaggery for sweetness — set aside to allow flavors to come together.
Peel and finely chop raw green mango into half-inch pieces and place in a large mixing bowl.
Peel and finely chop ripe mango into similar-sized half-inch pieces and add to the same bowl.
Finely dice onion and red bell pepper to similar size and add to the bowl.
Roughly chop fresh mint leaves and add to the bowl.
Roughly crush roasted peanuts to a coarse texture — not powder — in a zip-lock bag with a rolling pin and add to the bowl.
Pour prepared dressing over the salad mixture and toss gently but thoroughly until every component is evenly coated.
Taste dressed salad and adjust seasoning — it should taste bold bright spicy and sweet with both raw mango tartness and ripe mango sweetness clearly present.
Allow dressed salad to sit for 5 minutes to let flavors develop — no longer to maintain best texture.
Fill a wide shallow bowl with warm water for soaking rice paper.
Submerge one rice paper wrapper in warm water for exactly 5–8 seconds — remove while it still feels slightly stiff and semi-rigid — do not over-soak.
Immediately drape soaked rice paper over the back of a small rounded coffee mug and press gently against the surface to create a bowl shape — OR press into the inside of a small bowl ramekin or muffin tin cup pressing against sides to create cup shape from inside.
Allow shaped cup to firm up for 2–3 minutes until it holds its shape — repeat until you have enough cups for serving.
Place one romaine lettuce leaf in the base of each firmed rice paper cup — the lettuce acts as a natural liner that adds crunch prevents dressing from soaking directly through the rice paper and adds a fresh flavor layer.
Fill each lined cup generously with the dressed double mango salad piling slightly above the rim for the most visually appealing presentation.
Top each filled cup with an additional pinch of crushed roasted peanuts and a small fresh mint leaf for garnish.
Serve immediately while rice paper and romaine retain their best texture.