This is a fun play on a classic scampi with big, bold flavors and a cool twist on the plate.
In a large bowl combine prawns, green onions, cilantro, garlic, shallot, lime juice, fish sauce, soy sauce, sesame oil, sambal and tomatoes. Marinate 2 hours.
Heat a large saute pan over medium-high heat. Remove prawns from marinade and saute 1 minute. Flip prawns and add half of marinade to pan and saute another minute. Add butter and swirl to incorporate. Reduce heat to simmer and cook 5 minutes. Set aside.
Slice baguette into 1-inch thick by 6-inches long pieces. Toast. Spread/smash half of an avocado on each toasted baguette. Top with prawns and then spoon remaining marinade over prawns.