If using canned beans; rinse under cold water well. If using fresh you will need to cook them until tender. I use the canned, it's much easier.
Dice all veggies except your jalapeno and set aside (don't dice them too fine, you'll still want to have a nice bite to them - Think same consistency as Salsa) Slice your jalapeno into thin round slices (use your judgement on these, less is more but if you're a lover of spicey food go for it!).
Place all your ingredients in a bowl, mix well, salt and pepper to taste and cover. Chill for 2 hours or overnight.