Preheat oven to 400 degrees (375 degrees convection bake).
Place plantain slices cut side down on a baking sheet. Drizzle with oil and sprinkle with salt. Place in hot oven. Cook until very tender and caramelized (about 20 minutes).
While plantains roast, add to a large pot or dutch oven, the ground meat and olive oil. Over medium high heat, break up ground meat, add the onion and garlic, and cook until meat is browned.
Add the cumin and sherry (or other vinegar). Stir to loosen browned bits. Add the broth/stock, olives, raisins, shredded carrot, and aji amarillo paste. Stir to combine, and reduce heat to a simmer. Stir occasionally.
Make the topping. When the plantains are very soft, add to a medium mixing bowl. Add banana and lime juice, and mash with a potato masher. Mixture doesn't need to be completely smooth. Add milk/cream to desired consistency, and season with salt and pepper.
Assemble the Savory Plantain Pie. Divide the meat mixture between the 4 ramekins/casseroles. Top each with a layer of mashed plantains.
Place in a hot oven. Make the panko crumbs while they start cooking.
Toast the panko with the oil in a skillet on medium high until crumbs are browned.
Spoon toasted crumbs over the casseroles. Continue baking for a total of 25 minutes.
Remember the casseroles are hot! I serve them on a hot pad with strict reminders... Enjoy!