Philly cheesesteak with ribeye from the Big Green Egg

Ingredients

• 2 ribeye steaks of approx. 300 g
• 1 tbsp olive oil
• 1 onion
• 4 rolls of your choice
• 1 shallot
• ½ red Spanish chilli pepper
• 200 g cheddar
• 1 tbsp butter
• ½ tbsp flour
• 100 ml milk