Directions. Melt the butter and oil in a heavy skillet over medium-high heat.Add the garlic, onion and jalapeno.Cook, stirring until the onion begins to wilt, approximately 3 minutes.Add the red pepper flakes and oregano.Continue cooking until the onion becomes translucent, approximately 3 additional minutes.Add the tomatoes.Cook, stirring occasionally, until the tomatoes are soft.Add the shrimp, zest and lime juice, salt and black pepper.Cook until the shrimp are just opaque. Be careful not to overcook.Remove the pan and serve