Easy Cucumber Salads

Ingredients

• 1 medium cucumber
• 1⁄4 tsp salt
• 2 large spring onions (scallions) with green stems, finely sliced
• 4 medium red radishes, thinly sliced
• 1⁄2 cup (125 g/4 oz) sour cream
• 2 tbsp tarragon vinegar or white wine vinegar
• 1 tbsp finely chopped fresh dill or 1 tsp dried dill
• 1 tsp sugar
• 1 tsp Dijon mustard
• 1⁄4 tsp freshly ground black pepper