Cook the achard masala paste. Add the 2 tablespoons of the remaining vegetable oil to the leftover oil in the pan, along with the mustard oil. Be careful as the oil and masala might splatter a little with the next step. Be prepared to cover the pan slightly so that masala does not splatter too much. Once the oil is hot enough, but not smoking, add the mustard seeds and cook for 30 seconds. Don't overcook them as it will turn the mustard seeds bitter.Next, gently add the masala paste mixture to the pan. Cook until the water evaporates and the masala becomes fragrant, about 2-4 minutes. Scrape off the spices from the bottom of the pan if they seem to be sticking to it. Add garlic and green chili peppers. Add the garlic and green chili peppers, and cook until the chili peppers are just cooked, about 1-2 minutes.
Add the rest of the ingredients. Add the white vinegar, lemon juice and salt to the pan mix everything evenly. Make sure your spices do not stick to the pan. Scrape off the spices from the bottom of the pan if they seem to be sticking to it. Cook until the liquid has evaporated a bit. Refer to the Recipe Notes section below if you prefer your vegetables on the softer side.
Add vegetable mixture and taste test. After you add these, make sure all the ingredients in the achard mix evenly. Taste it and see if the white vinegar, lemon juice or salt need to be adjusted.
Enjoy immediately with a French baguette. If you are keeping it for later, wait for the vegetable achard to completely cool down before transferring it to a jar. This prevents condensation and thus extends the life of the achard. It keeps for weeks in the fridge. Add some additional white vinegar and top it with oil if you to extend it even further.