Fry onions and bacon in lard until golden brown, dust with flour (the mixture should be creamy) and roast until light brown.
Reduce heat, add paprika powder and vegetables, deglaze with vinegar or white wine and slowly pour cold cooking stock little by little. Boil everything well and season to taste with spices and chopped garlic.
Add sliced tripe and simmer on low heat for at least 60-90 minutes.