First wash and clean the peppers (removing the stalk and the internal seeds) and the onion, then cut the first into strips and the second into slices.
Add peppers, onion, tomatoes (washed and cut into pieces), well desalted capers, salt and oil in a bowl and mix.
Then transfer to an ovenproof dish suitable for cooking in the oven and cook for about 40 minutes in a preheated static oven at 200 ° C, mixing well halfway through cooking (therefore after the first 20 minutes).
The baked peppers are ready: mix again, let it cool a little and serve.
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