Peel and wash the potato, onion and carrot, then slice each to 2-4 pieces.
Place the ground beef at the center of a large deep skillet, then arrange the carrot around it.
Add the bay leaf, then pour the water into the pan, so it reaches the top of the meat. You might need more water, depending on the size of you pan.
Cover the pan and cook over medium-hight heat until the 90% of the water have been evaporated (should take about 30 minutes).
Using a potato masher, or a wooden spoon, mash the meat while cooking on medium heat until the water have completely evaporated, and the meat is no longer red or pink. (some beef browning are ok)
Remove from heat, and set aside to cool for 15-20 minutes.
Discard the bay leaf, and carrot, then transfer the meat, potato, and the onion to a bowl of a food processor.
Add the spices and process until you have a smooth, pasty mixture.
Transfer to an airtight container and refrigerate until use and up to 48 hours.