Remove the onion from the pan and add the squid. Cook the squid until the liquid has evaporated.
When the squid begins to brown, add the onions. Cover and simmer for 5 minutes.
Next, add the flour and stir briefly, then add the boiled white wine and hot water. Peel and finely mince the garlic, then add it to the mixture. Season with salt and pepper.
Let it continue cooking, covered, over low heat. The total simmering time should be 30 minutes .
Preparing the rice
Bring to a boil a volume of water equal to three times the volume of the rice. Add the white wine, salt, pepper, garlic, saffron, and sage.
Next, add the rice and let it simmer for about 20 minutes (though this will depend on the type of rice you choose—precooked, white, semi-whole grain, or whole grain, in order of increasing cooking time). Keep an eye on it while it cooks; the rice should still be firm when done.
Drain the rice, place it in a serving dish with a knob of butter. Serve the squid with the rice right away!