Tarragon Chicken

Name: Tarragon Chicken
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: French
Ingredients: 2 tbsp olive oil; 4 chicken breasts (about 175g/6oz each (700g/1.5lbs altogether)); ½ tsp salt; ½ tsp black pepper; 1 small onion (peeled and finely diced); 2 minced cloves garlic; 120 ml (1/2 cup) white wine (*see note for non-alcohol version); 120 ml (1/2 cup) chicken stock (water + 1 stock cube is fine); 1 tsp dried tarragon (or 2 tbsp finely chopped fresh tarragon); 180 ml (3/4 cup) double (heavy) cream; small bunch of fresh tarragon (roughly torn); pinch black pepper