Caramelised Sauteed Greens | Blossom Avenue

Name: Caramelised Sauteed Greens | Blossom Avenue
Ingredients: 1 chicken / vegetable stock cube; 500ml boiling hot water; 2 tbsp extra virgin olive oil; 500g greens / 1 x small savoy / sweet heart cabbage finely shredded; ½ tsp finely grated / crushed garlic; 1 heaped tsp dried mint; ¼ pinch coarse black pepper; Pinch of sea salt flakes (optional, to taste, as stock can be quite salty once reduced); A knob of butter; Grated zest of 1 lemon