An easy way to ruin chilli is by adding too much vinegar, a flavour that will overpower other ingredients. Even if you're making a spicy chilli, vinegar will stand out if you've added too much, an inconvenience if you've already spent a couple hours cooking. Thankfully there are easy ways to remedy the situation. Many cooks add other ingredients to balance the flavour, including extra tomatoes and brown sugar.
Add a can of tomatoes if your chilli tastes too strongly of vinegar. Mix tomatoes in with large stirring spoon and simmer chilli for 15 minutes.
Add brown sugar to chilli. Pour brown sugar into a measuring cup and fill to 1/8 cup. Mix brown sugar in with large stirring spoon and simmer chilli for 15 minutes.
Taste to ensure that the chilli has a good flavour. Repeat Steps 1 and/or 2 if the chilli still has too much vinegar. Remove chilli from stove and cool before serving.
Add a dollop of sour cream when serving chilli if it is too spicy or contains too much vinegar.