The best replacement for jalapeno is serrano.

The best alternatives to jalapeno are rated as following:
★★★★★  serrano
★★  habanero
★★  serrano peppers
★★  cayenne
★★  green chili
★  poblano
★  ghost pepper
★  pepperoncini
★  fresno pepper
★  habanero pepper
★  green chile
★  jalapeno
★  red chili
★  green jalapeno
★  chili
★  serrano hotter
★  habanero hotter
★  banana peppers
★  poblano hotter
★  anaheim peppers
  chili pepper
  cayenne hotter
  green chilis
  chipotle
  habanero scoville
  chili peppers
  cayenne peppers
  pepper
  roquito
  serrano pepper
  anaheim
  serrano chili

Your alternative for jalapeno is not listed? Suggest!
Speaking about jalapeno, one probably shouldn't forget about cheddar cheese.

Other search terms related to jalapeno and their ratings are:
★★★★★ cheddar cheese
You have in mind a companion for jalapeno and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of jalapeno in all years. Click on graph for more.
jalapeno
serrano
habanero