Add the diced onions to the pan. Adjust the heat if necessary, onions should not brown in the cooking process.
Saute the onions until they become translucent.
Add the arborio rice to the pot. Stir the rice, coating the rice with the oil. Rice will toast and begin to release a nutty aroma. Avoid browning the rice.
Once you begin to smell the nutty aroma, add the white wine. It should just cover the rice. Bring to a boil, then reduce the heat to a simmer. Cooking over a low simmer allows the rice to slowly absorb the liquid as well as slowly releasing the starches to produce the creamy texture of the finished risotto.
Stir the rice and wine occasionally to avoid sticking and redistribute the rice into the wine to allow for absorption.
As you stir the rice, you will begin to see the bottom of the pan is drying out.
Add the first addition of the chicken or vegetable broth to the pot. Add enough to cover the rice. Bring to a boil again and reduce to a low simmer. The same process as the wine addition to the rice - Cooking over a low simmer allows the rice to slowly absorb the liquid as well as slowly releasing the starches to produce the creamy texture of the finished risotto.
Add the diced carrots and stir to incorporate.
Stir the rice and broth occasionally to avoid sticking and redistribute the rice into the wine to allow for absorption.
As you stir the rice and broth, you will begin to see the bottom of the pan is drying out.
Once you get to this point, add a second addition of broth to the pot and proceed with the same process as the first broth addition.
Add the yellow squash, tomatoes & asparagus.
Taste the rice at this point. You may need to add 1-2 more additions of liquid to get the rice to a soft al dente texture. Add another addition of broth just to cover the rice if more cooking time is needed. Follow the same process for cooking over a low heat to allow the rice to release the starches and absorb the broth.
Once the rice is tender enough and the broth is mostly absorbed, remove from the heat.
Add the spinach and stir to incorporate.
Add the parmesan cheese, stir to incorporate.
Stir in the black pepper.
Add the butter and stir to incorporate. The risotto should have a creamy texture to it. Where is slowly falls off of it self.
Garnish with additional parmesan and cracked black pepper as you like.