In a medium skillet, pour a little extra virgin olive oil and bring it to medium heat.
Cook the onion until it becomes soft. Add the chorizo.
Turn up the heat, stir fry briefly and add the sliced Manzanilla olives.
After a couple of minutes, add the quince paste and mix with the other ingredients.
Add the brandy, and flame it in order to evaporate the alcohol and concentrate the flavours.
Let the mixture rest for a few minutes.
Slice your Porras lengthwise, and stuff them like a sandwich.
Pour yourself a cold beer.