Melt the bacon grease in a large frying pan over medium-high heat
Add the onions and bell peppers and saute for about 8 minutes until the onions start to clear.
Add the garlic and about ½ of the Herb and Spice Blend, stir for about 2 minutes until aromatic.
Mix in the chopped mirliton until well combined with the other ingredients.
Continuing over medium-high heat, use a potato masher or a wooden spoon to mash the larger pieces.
Saute for about 5 minutes
Add the chopped shrimp and stir it together.
Add about ½ of the remaining Herb and Spice Blend
Add the chopped tomatoes, stir everything together and simmer for another 5 minutes.
At this point, there should be some liquid in the pan as a result of the simmering.
Add the bread pieces and stir to thoroughly combine all the ingredients. (see Notes)
Remove the pan from the heat, cover and let sit about 10 minutes.
Pour the dressing into the 9 X 13 prepared baking dish.
Place the baking dish in the preheated oven and bake for 30 to 40 minutes, until firm and golden brown on top.