1. Cook tomato relish.

Halve tomatoes, scoop out and discard seeds, then roughly chop. In a large pot, heat oil over medium heat. Add garlic and onions, cook 4 to 5 minutes, stirring often. Add tomatoes, vinegar, sugar, mustard powder, chili, a bit of salt and pepper, and 1/2 cup of water. When mixture boils, reduce to a simmer and cook, stirring, 15 to 20 minutes, until tomatoes are broken down and mixture is thick. Cool slightly before serving. (The recipe makes between 3 cups to 1 quart of relish.)

2. Make burgers.

Heat oven to 400 degrees. Finely grate 1 zucchini and gather in a cheesecloth. Wring out as much moisture as possible, then transfer to a bowl. Add ground turkey. Season with salt and pepper. Mix until combined. Form burgers into 4 patties.

Heat a thin layer of olive oil in a large, oven-safe skillet over medium heat. Cook turkey patties 5 minutes on each side. Then top each one with a slice of cheese and transfer to the oven for about 5 minutes, until cooked through.

3. Make the zucchini garnish.

As the burgers cook, heat a thin layer of olive oil in a second skillet over medium-high heat. Slice 1 zucchini 1/2-inch thick and add to hot skillet in a single layer. Season with salt and pepper, and cook about 3 minutes per side until zucchini is soft and both sides are brown.

4. Prep and serve.

Toast burger buns. Assemble burgers with tomato relish, cooked zucchini, and chosen garnishes.