Take a blender, food processor, or chopper. Make sure it is clean and dry. Since salsa should have a chunky texture, avoid blending on high speed.
Add the chopped onion, garlic cloves, green chillies, fresh coriander leaves, half of the chopped tomatoes, lemon juice, red chilli flakes, black pepper powder, cumin powder, and salt to taste to the blender.
Pulse 2-3 times to blend them coarsely.
Now add the remaining tomatoes and pulse 2–3 times to blend them coarsely. This helps maintain the texture, especially if the chopper is small. Do not blend continuously.
The salsa should be slightly chunky and not smooth like a paste.
Transfer the salsa to a bowl. Taste and adjust salt, lemon juice, or spice according to your preference.
Let the salsa rest for 10–15 minutes. This allows all the flavours to blend well and enhances the overall taste.
Your homemade nachos salsa is ready. Serve fresh with nachos, tortilla chips, tacos, wraps, or sandwiches.