Preheat the oven to 200°C/180°C fan. Juice the lemon into a bowl and mix with the garlic paste, thyme, salt and pepper. Add the chicken breast to the marinade and set aside.

Peel and thinly slice the carrots. Separate the cauliflower into florets and chop it into bite-sized pieces. Place the carrots and cauliflower on a baking tray. Top with the rosemary, salt and a drizzle of oil. Toss. Bake for 12-15 min or until starting to soften.

Meanwhile, heat a non-stick pan over a medium heat with a drizzle of oil. Once hot, add the chicken breast and cook for 5-6 min on each side or until cooked through. Transfer the chicken to a plate to rest. Reserve the pan.

Return the pan to a medium-high heat with the chicken stock and a pinch of salt. Bring to a boil. Simmer for 4 min. Reduce the sauce until it thickens. Add the butter and whisk until dissolved. Cover and reserve.

Meanwhile, bring a pot of salted water to a boil. Remove the green asparagus' woody stem. Cook the asparagus in a pot of salted boiling water for 3-4 min or until tender. Drain once tender.

Slice the cooked chicken breast. Divide the asparagus, carrots, cauliflower and chicken among plates. Spoon over the pan sauce over the top.