Create a bold, vector-style cartoon hamburger sticker placed on a dark, textured grunge background. The burger features a glossy orange-yellow sesame bun top, crisp green pickles, bright red tomato slices, wavy yellow cheese, two brown beef patties with sear, and a bottom bun with a warm orange-yellow gradient. Use thick black outlines, simple shapes, and high-contrast saturated colors to give a shiny, sticker-like appearance. Add subtle highlights and minimal shading for depth. The background is dark gray with scratches and blotches to create a gritty look, while the burger remains the clear focal point with crisp, cartoonish lines.