Not so hard!
And cheaper, fresher, and packaging free! Also freezes well, so you can control food waste.
1 cup sesame seeds (Ruddy bulk section)
2 tbsp olive oil or grapeseed oil
a bit of salt (optional)
toast the sesame seeds in the oven
grind in a food processor until the mixture forms a crumbly paste
add oil and process for 1 to 2 minutes, until a smooth paste forms (add more oil to get desired consistency)
add salt to taste
Store in a sealed container in your fridge for a month.