1Preheat your oven to 375°F (190°C).
Place the 4 slices of whole grain bread on a baking sheet and toast them in the oven for about 5-7 minutes, or until they are golden brown.
In a medium bowl, combine the finely chopped tomatoes, finely chopped onion, and finely shredded cabbage.
Add the red chili flakes and olive oil to the vegetable mixture. Mix well to combine.
Season the mixture with salt to taste.
Once the bread is toasted, remove it from the oven and let it cool slightly.
Spoon the spicy tomato and onion mixture evenly over each slice of toasted bread.
Serve immediately and enjoy your Spicy Tomato and Onion Bruschetta!