Chop all vegetables into evenly sized pieces to ensure they cook uniformly and create a balanced texture throughout the dish.
Cook eggplant in olive oil until softened and lightly browned, which helps it absorb flavor and prevents it from becoming rubbery later.
Sauté onion and garlic until fragrant and translucent, building a strong flavor base for the entire recipe.
Add bell peppers and zucchini, cooking until slightly tender while maintaining their shape and structure.
Stir in tomatoes, tomato paste, and seasonings, allowing everything to combine into a cohesive sauce.
Return eggplant to the pan and simmer gently until all vegetables are tender and flavors are fully developed.