To make the jammy zucchini: Heat the olive oil in a medium skillet over medium heat. Add the onion and salt. Cook for about 10 minutes, until the onion just starts to soften. Stir in the zucchini, cover, and cook for another 10 minutes. Remove the lid, lower the heat to medium low, and continue to cook, stirring occasionally, until the zucchini has broken down and is lightly caramelized, 25-35 minutes. Stir in the heavy cream and set aside until ready to use.: The pan should smell gently sweet and savory within minutes, a low sizzle that tells you the olive oil and onion are warming. As the onion softens, it releases sugar and a faint caramel aroma fills the air. Stirring occasionally keeps the pieces from sticking and ensures even browning. You will hear a soft, steady sizzle as moisture evaporates, and visually you’ll see the onion turn translucent and then pale gold. The slow transformation matters because quick high heat will char the outsides and leave raw centers, so maintain medium heat. A common misstep is rushing at high heat; that results in uneven texture and a burnt note. Keep the skillet covered at first to help the zucchini sweat out moisture, then uncover to let the reduction begin. Once you lower the heat to medium low, the cooking takes on a gentle, rhythmic quality as the zucchini breaks down, becoming tender and slightly jammy. The scent will deepen into a warm vegetal sweetness, and the surface will show scattered, glossy brown bits where sugars have caramelized. When the mixture reaches that stage, stir in the heavy cream off heat to add silkiness, tasting to adjust seasoning. If your mixture seems too watery midcook, be patient and continue to reduce; resist the urge to add extra fat or liquid, which can dilute flavor.
To make the pizza: While the zucchini is cooking, preheat an oven or grill (whichever you prefer for cooking pizza). Let the pizza dough rest, covered, at room temperature, while preheating and prepping.: While the topping is simmering, you will feel the room warm slightly from the oven, and the dough resting at room temperature becomes more elastic and relaxed. Letting the dough sit under a light cloth helps it relax; when you stretch it, it should feel pliable rather than springy. Dust your peel with a light layer of flour so the dough slides easily without tearing. If the dough resists, let it rest a few more minutes. A frequent error is overstretching too quickly, which creates thin spots that can bubble or tear in the oven. Preheating your oven or grill to a high, steady temperature is crucial so the crust crisps quickly when it hits the heat.
Stretch the dough into a 12-inch circle. Place on a floured pizza peel, spread the jammy zucchini over the dough, and sprinkle with the mozzarella cheese. Bake until the cheese is bubbly and the crust is golden brown and cooked through. (The cook time will depend on your chosen pizza-making method.): As you stretch, listen for a faint slackening in the dough that tells you the gluten has relaxed. Place the dough on the floured pizza peel and feel the surface for even thickness. Once stretched, spread the warm jammy zucchini across the surface, leaving a border for the crust to develop. The visual cue is a glossy, compact layer that holds together rather than a loose watery pile. Scatter the torn or shredded mozzarella cheese so it melts into pockets, browning in places for contrast. If you notice pools of liquid after spreading, blot lightly and continue; excess moisture can make the crust soggy. Avoid piling the topping too thick, which prevents even cooking and can weigh down the dough.
To serve: Once the pizza is cooked finish with black pepper before serving.: Slide the pizza into your preheated oven or onto the grill, and listen for an immediate, lively sizzle as the crust hits high heat. The smell will shift to toasty and slightly nutty as the crust browns, and the mozzarella will melt into glossy, bubbling patches. Watch the crust edges for golden coloring and the underside for a toasted pattern, both cues that the heat is doing its job. Baking time varies by method, but the sensory signs are consistent: bubbling cheese, a fragrant toasty aroma, and a firm yet springy crust. A common mistake is underbaking due to low temperature, which leaves a pale, doughy base. If the top browns too quickly before the base cooks through, lower the top heat or move the pie to a lower rack to allow the bottom to crisp.
To serve: When you remove the pizza, the first sensory note is the steam rising with a warm mix of caramelized zucchini and toasted crust. Letting it rest briefly keeps the melted mozzarella from sliding off, and the topping sets into neat, sliceable ribbons. Finish with a few turns of black pepper for a bright aromatic lift that contrasts the sweet jammy topping. Cutting too soon can smear the topping, so allow a minute to settle; rushing this final step often creates a messy presentation. Serve slices warm, noticing how the textures contrast: crisp crust, silky zucchini, and stretchy cheese.