In a stand mixer bowl fitted with a paddle attachment, add in ground beef, coriander, oregano, thyme, garlic powder, onion powder, salt, black pepper, paprika, cayenne powder and breadcrumbs.
Mix on low speed until the mixture comes together. After a few minutes, add in the cold water and continue beating, until the meat mixture is homogenous, with strands starting to form, about 8-10 minutes.
Transfer the mixture to a large piece of aluminum foil.
Use slightly wet hands to slap the meat about 10 times against the foil to remove any air bubbles.
Form the meat into a densely packed log shape.
Wrap the meat up with the aluminum foil.
Double wrap with foil to avoid leakage.
Place it onto a baking sheet or tray lined with aluminum foil or parchment paper.
Bake at 325°F/163°C for 50-60 minutes, or until it reaches an internal temperature of 160°F/71°C with an instant thermometer.
Optional step: carefully open the foil while warm and use kitchen paper towel to blot excess grease.
Let cool completely, wrap tightly and chill in the fridge for at least 6 hours, or overnight before slicing.
Make the sauce:
In a bowl, stir together sweetened condensed milk, white vinegar and garlic powder.
Cover with plastic wrap and place into the fridge to sit for at least 1 hour before serving.
Notes
You can adjust the amount of vinegar depending on how sweet or tangy you like your donair sauce.