In a large saute' pan or skillet heat the olive oil and saute' the garlic, shallots and peppers until aromatic. Add sausage and saute' a few minutes to brown. Add the tomatoes and saute for a minute or two. Move all of the ingredients to the outer rim of the pan, making space in the center to cook the shrimp. Cook shrimp on both sides until just pink but not quite done in the center. Add wine and reduce. Add cream and cajun seasoning. Reduce until sauce thickens a bit. Adjust seasonings with salt and pepper to taste and a squeeze of fresh lemon juice. Stir to combine. Garnish with sliced scallions.