Heat oven to 190C/170C fan/gas 5.
Halve the 2 part-baked baguettes
lengthways and cook directly on the oven
shelf for 8 mins. Meanwhile mix the
diced peppers, sweetcorn, tuna, and 75g of the grated cheddar.
Transfer the baguettes to a baking tray,
spread each with 1 tbsp tomato purée,
divide the tuna mix over, then sprinkle
with the remaining grated cheddar. Bake
for 12 mins until melting and golden.