Heat oven to 190C/170C fan/gas 5.
Put the carrots and onions in a large
roasting tin, drizzle with the oil and
season well. Roast for 25 mins.
While the vegetables are roasting,
boil the farro or spelt following pack
instructions. Drain and tip into a bowl.
Mix the dressing ingredients with 1 tbsp
water and some seasoning, then stir half
through the warm grains.
When the vegetables finish cooking,
pour over the remaining dressing and
mix well. Toss with the grains and
spinach, then crumble over the feta.