Cut the sausage into small bite-sized pieces.
Heat olive oil in a medium-sized cooking pot.
Add the sausage and cook for about 2 minutes stirring until nicely browned.
Take the pot off the heat and transfer the sausage to a plate with a slotted spoon. Scrape the bottom of the pot with a wooden spoon to remove any brown or burned bits.
Return the pot to the heat.
Saute onion over medium-low heat and once softened add the garlic.
Add tomato paste and cook for a minute while stirring.
Pour in the water or stock and the dried oregano.
Add the Trahana once the soup starts to bubble.
Simmer for 10 minutes. Stir often so it won't stick to the bottom.
Return the sausage to the pot. Simmer for another 5 to 10 minutes stirring often until Trahana is tender and soup thickened.
Serve with freshly ground pepper on top, hot red pepper, or hot red pepper flakes.