Not sure what sorts of things in the allium family you have in Ethiopa, but roasted garlic is one of my favorite dressing bases. You can "roast" it vigilantly on the stovetop over medium heat---don't peel the garlic, just separate the cloves of a head or two and shake the skillet fairly frequently, cooking for about 15 minutes or until very soft and a little browned. This mostly kills the "bite" garlic has in raw form and brings out a creaminess and sweetness that makes the most amazing dressing. With two heads of garlic you can make this dressing:
1/4 c. roasted garlic (yes, that much)
3 Tbsp. olive oil
2 Tbsp. water
2 Tbsp. apple cider vinegar
1 Tbsp. dijon mustard
1/2 tsp fresh minced thyme, or a pinch dried
1/2 tsp. salt
1/8 tsp pepper
Blend in a food processor or blender. Keeps up to 4 days in fridge.
I like to add a small amount of minced (raw) shallot or red onion to whatever dressing I am making; without it they just tend to taste shallow and bland to me. A pinch of sugar can add balance, and any kind of whole grain or Dijon mustard also gives a depth of flavor and a kick.