Place the cut red potatoes and 1 TBSP salt in a large stock pot over medium-high heat and bring to a boil, stirring occasionally. Once boiling, lower the heat to medium and let cook undisturbed for 8 minutes, or until fork tender. Remove from the heat, drain the potatoes in a large colander and let cool for 5
minutes. Transfer cooled potatoes to a large serving bowl. Combine the vinegar, olive oil, garlic, sugar, both mustards, salt and pepper in a Pyrex measuring cup, whisking till combined. Heat a medium skillet over medium-high heat. When the pan is hot, add the bacon and cook, stirring frequently until the bacon browns. Add the shallots and cook, stirring frequently for 1 minute. Add the red bell pepper and green beans and cook for another 3-5 minutes, stirring frequently until the green beans are fork tender.