Place chicken livers on kitchen paper, and take out as much moisture as possible. Trim and discard any visible membranes and fat.
In a clean, dry plastic bag (I always use Ziploc as they are thick and secure very well) add the flour and seasoning and shake well. Add the chicken livers, seal the bag, shake well (to ensure all livers are equally coated) and set aside.
Heat up 1 tbsp olive oil, then add the finely sliced onions and heat for 2-3 mins on a medium heat. Then, add the grated (or finely sliced) garlic, season with seas salt and black pepper, and continue for 2 minutes until soft. Remove from pan, and add second tbsp olive oil, and turn up heat slightly.
Add chicken livers, and fry for 2 mins, then turn over and cook the other side for a further 2 mins. Then, pour over the brandy,heat for 20-30 seconds then ignite (be careful!).
Turn down to a low heat, return onions to pan, and add Dijon mustard, stirring through evenly.
Take a large bowl, add the shredded romaine lettuce, then the baby spinach leaves. Drizzle with olive oil, juice of half a lemon, and season with a little salt and pepper.
Pour chick livers over salad, and garnish with parsley.