You're likely using the Classic brew setting, which is designed for a milder flavor. Here's how to strengthen it.
First, try the Rich brew setting. After you select your brew size, press the "Brew Style" button until the Rich indicator light is on. Then start your brew. This uses a different temperature and flow rate for bolder coffee.
If it's still too weak, you need to adjust your coffee-to-water ratio.
- Use the Ninja Smart Scoop. For stronger coffee in the Rich setting, you can add an extra scoop of grounds to the filter.
- Ensure you're using the correct grind. Medium grind is recommended. Finely ground coffee can clog the basket and lead to overflow, not weakness.
If you're using pods, strength is fixed by the pod. You can't adjust it.