1. Preheat the oven to gas 3, 170°C, fan 150°C. Line a 12-hole
muffin tin with paper muffin cases.
2. Tip the celeriac, walnuts and orange zest and juice into a large bowl,
mix well to combine, then add the oil and the eggs.
3. Sieve the flour into the other dry muffin ingredients and mix to combine.
Gradually fold the dry ingredients into the wet ingredients, until just combined.
Spoon into the muffin cases. Bake in the oven for 15-18 mins, until risen and golden. Set aside to cool completely.