Peel and shred the beetroots and carrots using a box grater or food processor.
Finely chop the spring onions and red chilli pepper.
In a small bowl, whisk together olive oil, mustard, lemon juice, and apple cider vinegar until well combined.
In a large mixing bowl, combine the shredded beetroots, carrots, chopped spring onions, and chilli.
Pour the dressing over the vegetables and toss thoroughly to coat.
Add poppy seeds and season with salt to taste.
Allow to sit for 10 minutes before serving to let flavors meld.