Before start making sekaná, preheat the oven to 340 °F (180 °C).
Pour about ½ inch layer of water into the baking tray. Water and the fat make great dripping, poured over the sekaná while baking.
Peel onions and chop them finely.
Peel cloves of garlic and mash them, use a garlic press.
Add cubed white bread in a shallow bowl and pour over the warm milk. Let the bread cubes soak up all the milk, it takes about 5 minutes.
Place ground meat, both beef and pork, in a large mixing bowl.
Add chopped onion, mashed garlic, whole egg, soaked bread. Taste with crushed caraway seeds, dried marjoram, and ground pepper. Add salt.
Mix everything, preferably with your hands. Start with a fork, continue with your fingers. You need to make a smooth mass out of all ingredients. It takes about 2-3 minutes. If you find the meatloaf mix too thin, add some bread crumbs.
Shape a loaf, transfer it into a baking tray carefully, smooth the meatloaf surface.
Bake the meatloaf for 1 hour, pour the dripping in the bottom of the tray over the meatloaf at least twice.
Take it out of the oven and let it rest for 10 minutes before serving.
Serve warm, sliced, with potatoes (mashed or boiled).