Preheat your oven to 350°F.
While it heats up, prepare your ingredients.
In a medium skillet, heat 1 tablespoon of vegetable oil.
Sauté the green bell pepper, red onion, carrot, and minced garlic for about 5 minutes until they soften.
In a large mixing bowl, combine the sautéed vegetables with the ground beef, ground pork, eggs, milk, and bread crumbs.
Mix until everything is well incorporated.
Shape the mixture into a loaf and place it in a 9 x 5-inch loaf pan.
In a separate bowl, combine ketchup, brown sugar, and Dijon mustard to make a glaze.
Spread half of the glaze over the meatloaf.
Bake the meatloaf for 50 minutes.
After this, remove from the oven and spread the remaining glaze on top.
Return to the oven and bake for another 10 minutes.