1.
Preheat the oven to 220°C.
2.
Halve the eggplants lengthwise and prick them with a fork.
3.
Brush the eggplants with a little oil.
4.
Bake on the middle rack of the oven until the skin is wrinkled and the flesh is very soft, about 30–40 minutes.
5.
Place the still-warm roasted eggplants together with the above ingredients into a food processor and blend until the mixture is very smooth and creamy.
6.
Place heatproof jars with lids in boiling water for 5 minutes and let drain upside down.
7.
Fill the jars with the roasted eggplant dip and seal tightly.
8.
Place the jars upright in a pot of water. The lid must be covered.
9.
Heat the water and set a timer for 25 minutes once the water starts to boil.
10.
Let the jars cool in the pot. Store the dip or enjoy immediately.