Potato: 150g (1 medium, diced), Green beans: 100g (1 cup), Cherry tomatoes: 100g (1/2 cup, halved), Red onion: 30g (1/4 small, thinly sliced), Olive oil: 10ml (2 tsp), Dijon mustard: 5g (1 tsp), Red wine vinegar: 10ml (2 tsp), Garlic: 3g (1 clove, minced), Fresh parsley: 5g (1 tbsp, chopped), Fresh dill: 5g (1 tsp, chopped), Salt: 1g (1/4 tsp), Black pepper: 1g (1/4 tsp)