Homemade Fish ‘n’ Chips

Name: Homemade Fish n Chips
Prep time: 15 min
Cook time: 30 min
Ingredients: 900 g white potatoes (cut into chips (no need to peel)); 4 cod fillet; 200 g plain flour (+ extra); 2 tbsp baking powder; 250 ml beer (or lager); 500 ml vegetable oil; 50 g spinach; 180 g peas; 1 knob butter; 2 sprigs mint (leaves picked and chopped)