Chilli chutney quesadillas

Chilli chutney

• 500 g brown onion, cut into eighths, layers separated
• 1 apple, peeled, cored and cut into eighths
• 1 red capsicum, deseeded and cut into thin strips (1 cm)
• 2 tbsp brown sugar
• 40 g unsalted butter, cut into pieces (1-2 cm)
• ¼ tsp sea salt
• 2 tbsp balsamic vinegar
• 1 tsp dried chilli flakes

Quesadilla

• 8 multigrain tortillas
• 16 slices Swiss cheese
• 50 - 80 g fresh baby spinach leaves