Bacon and Herb Gravy

Name: Bacon and Herb Gravy
Prep time: 30 min
Cook time: 1 h 15 min
Total time: 1 h 15 min
Yield: 8 portions
Ingredients: 110 g red onions; 80 g smoked bacon; 4 garlic cloves; 30 g extra virgin olive oil; 2 heaped tsp fresh parsley leaves; 1 tsp dried oregano; ½ tsp ground black pepper; 80 g plain flour; 900 g chicken stock; 30 g unsalted butter; fine sea salt