Bombay Vegetable Sandwich with Cilantro Chutney

Name: Bombay Vegetable Sandwich with Cilantro Chutney
Ingredients: For Cilantro Chutney; 1 bunch cilantro (including stems); 1 clove garlic; 1 bird's-eye chili (up to 3); 5 teaspoons lime juice; 1 handful raw, unsalted peanuts; 1 pinch salt, to taste; 2 tablespoons water, to facilitate blending; For Vegetable Sandwich; 2 pieces whole-wheat sandwich bread; 1 teaspoon butter, for spreading; 3 to 5 pieces cucumber, peeled and sliced thinly; 3 to 5 pieces tomato, sliced; 3 to 5 pieces Idaho potato, boiled and sliced; 3 to 5 pieces beet, boiled and sliced; 3 to 5 pieces red onion, thinly sliced into rounds; 1 tablespoon prepared cilantro chutney; 1 pinch salt and pepper, to taste; 1 to 2 pieces sliced Cheddar or mozzarella cheese (optional)