In a wok or large skillet, heat 1 tablespoon of the oil and 1 table spoon of the butter. saute the sprouts in batches over medium-high heat until tender and caramelized. Cool and set aside.In a small pan, saute the chorizo until cooked through. Strain off the excess oil and cool.In a small bowl, pour the limejuice over the brown sugar and mix to dissolve.
Add the fish sauce and sambal.
Add 2 to 3 tablespoons of water as needed to balance.Prior to serving, heat the remaining tablespoon of oil in a large saute pan.
Add the chorizo and saute for 1 minute.
Add the Brussels sprouts and heat until warm.
Add half the lime-sugar mixture, adding more as needed to taste. To finish, stir in the remaining 2 tablespoons butter until melted.Divide among 6 bowls and garnish with cilantro leaves and tortilla chips.