Simmer buckwheat and millet together over low heat for 15-20 minutes. Meanwhile, dice the carrots, cucumber, and bell pepper into small pieces, and mince the onion and garlic.
Heat 2 tablespoons oil in a large pan over medium-high heat. Add the minced onion and garlic and cook for 2-3 minutes until softened. Add the diced cocktail tomatoes and 1 teaspoon red curry paste. Simmer for 5-8 minutes until the mixture forms a sauce.
Drain the cooked grains well and add them to the pan with the sauce. Stir in the diced carrots, bell pepper, and cucumber. Add 2 tablespoons olive oil and mix well.
Season to taste with your choice of spices such as thyme, ginger, basil, parsley, salt, and pepper.