Smoky beetroot and black bean sliders with soused cucumber

Name: Smoky beetroot and black bean sliders with soused cucumber
Prep time: 40 min
Cook time: 1 h 20 min
Total time: 1 h 20 min
Yield: 6 portions
Ingredients: 50 g apple cider vinegar; 1 tbsp white sugar; 1 long red chilli; 1 tbsp poppy seeds; ½ tsp salt; ½ tsp ground black pepper; 100 g Lebanese cucumber; 90 g brown onion; 1 garlic clove; olive oil; 1 tbsp chia seeds; 100 g raw beetroots; 1 tbsp pumpkin seeds; 400 g canned black beans; 2 tbsp chickpea (besan) flour; 1 - 2 tsp ground smoked paprika; 1 tsp liquid smoke seasoning; 180 g sour cream; 3 tsp horseradish cream; 6 slider buns