Visualize a lively and contemporary app icon for 'Hello Chef,' an AI-driven recipe companion. Craft a 2D, flat vector design featuring a cartoon-style chef hat as the central element. Integrate the word 'Hello' in a modern font, ensuring it complements the overall design without any facial features. Aim for a playful yet simple composition that effectively communicates the app's function of assisting users in discovering and following recipes. Experiment with colors and shapes to enhance the icon's visual appeal and make it instantly recognizable on users' screens.