1. Begin by heating the olive oil in a large, deep skillet or Dutch oven over medium heat. Add the finely diced yellow onion and cook, stirring occasionally, until it softens and becomes translucent, which usually takes about 3-5 minutes. Once the onion is soft, stir in the minced garlic and cook for another minute until fragrant, being careful not to let it brown. This step builds the foundational flavor of your dish.

2. Add the orzo pasta directly to the skillet with the onion and garlic. Stir continuously for about 2-3 minutes, allowing the orzo to lightly toast. This step helps to develop a nutty flavor in the pasta and prevents it from becoming mushy later. You’ll notice some of the edges of the orzo turning a very light golden color.

3. Pour in the vegetable or chicken broth. Bring the mixture to a gentle simmer, then reduce the heat to low, cover the skillet, and let the orzo cook. Stir occasionally to prevent sticking. The orzo will absorb the liquid and become tender, much like risotto, in about 12-15 minutes. Check for doneness – it should be al dente, meaning tender with a slight bite.

4. Once the orzo is cooked and most of the liquid has been absorbed, remove the skillet from the heat. Stir in the prepared basil pesto and heavy cream. Mix well until everything is thoroughly combined and the orzo is coated in the creamy, vibrant green sauce. The residual heat will warm the cream and pesto through.

5. Add the halved cherry tomatoes and grated Parmesan cheese to the skillet. Gently fold them into the orzo mixture until evenly distributed. The warmth of the orzo will slightly soften the tomatoes, releasing their sweet juices, and melt the cheese into the sauce, adding another layer of creaminess.

6. Taste the orzo and season with salt and freshly ground black pepper as needed. Remember that pesto can be quite salty, so taste before adding too much. Garnish with fresh basil leaves if desired, and serve immediately. This dish is best enjoyed hot, straight from the pan.