In a mason jar, add the sweet paprika and the salt, mix until incorporated.
Add the fresh sardines, the garlic clove, the fresh spring of rosemary, the dried bay leaves, fill half of the jar with olive oil, add the white vinegar and fill up the rest of the jar with some olive oil.
Fold the sardine tails to make them fit into the jar, close the jar with the lid and wrap it in a tablecloth.
Next, cover the bottom of a pressure cooker with a tablecloth, add the jar filled with the sardines and pour in enough water to almost cover the jar.
Cover the pressure cooker, bring it to a boil over medium heat and let it all cook for 5 minutes once pressure is reached.
Serve.